Instructables
Picture of Smartphone Controlled Wood Stand
The idea: Remote Controlling the pan movement of a heavy LCD TV, LCD Computer Monitor, or any other object using an Android Smartphone or a Windows, Linux or MAC computer or the manual controls on the Stand.

UPDATE: Control Up to 5 Stands at the same time using the Android Application or a Windows, Linux or MAC computer and all this using just one Arduino

Step 1: The Concept Design and the Prototype Videos

Picture of The Concept Design and the Prototype Videos
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- Conceptual design video:


-The Stand in action:
 

Step 2: The List of Tools, Materials and Machines

Picture of The List of Tools, Materials and Machines
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List of Tools
   - A compass (to draw circles on the wood)
   - A pencil (to mark specific points on the wood)
   - A hammer
   - A caliper ruler
   - A hot glue gun
   - A soldering iron
   - A dust face mask

List of Machines
   -
A lathe machine (to create perfect circles out of the pieces of wood)
   - A drill press (to drill concentric holes in the wood)
   - A grinder (to shape the tool for carving the wooden marble tracks)
   - A wood cutting machine (to hand the circles from the wood)

The List of Materials
   - A sheet of wood (18mm of hight and 800x500 mm)
   - An Arduino Board
   - A bluetooth module
   - 2 potentiometers
   - 7 led's
   - 1 hight torque servo (Hitec Mega Servo 805BB)  
   - 100 glass marbles with 16 mm diameter

Step 3: Cutting out the Wooden Circles

>>Safety warnings: Remember to wear glasses and a dust face mask when cutting the wood to avoid injury to the eyes and lungs

Instructions:
   - Start out by drawing three 240mm diameter circles on the wood sheet using the compass (with 120 mm radius)
   - Using the hand sew machine cut out the wooden circles
   - Stack all 3 wooden circles one on top of each other and drill a hole in the center (concentric hole)

From now on, the 3 wooden circles will be refered as:
   - the bottom wooden plate
   - the middle wooden plate
   - the top wooden plate

Step 4: Trimming the Wooden circles using a Lathe machine

Picture of Trimming the Wooden circles using a Lathe machine
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Because you cut the wooden circles by hand they are not exactly the same size so you need to carve out the wood from all 3 circles to create 3 circles with the "same size", this can be done by using a lathe machine.

>>Safety warnings: Remember to wear glasses and a dust face mask when using the lathe Machine

Instructions:
   - Pass a screw along the center of all 3 wooden circles and attach a bolt and nut to both ends
   - Attach the 3 joined wood circles to the lathe machine by holding the rear nut
   - Start the lathe machine and carve out the outer perimeter of the 3 circles
   - Stop carving the wood as soon as the 3 circles have the same size (radius)

Step 5: Creating a Metal tip to carve the wood track for the marbles

Picture of Creating a Metal tip to carve the wood track for the marbles
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To create a metal tip to carve the wood track for the marbles we use a small piece of metal sized 2x100x20mm

>>Safety warnings: Remember to wear glasses while using the metal grinder

Instructions:
   - Grab the piece of metal and draw a semicircle on the tip
   - The semicircle is 2 mm wider then the radius of your marbles
   - Using the grinder cut out the exterior part of the semicircle
   - Make sure you sharpen the finished metal tool in order to carve out the wood track
  
This tool we have just made is going to be used to carve the marble track in the wooden circles bottom and middle plates

Step 6: Carving out the Track for the marbles

Picture of Carving out the Track for the marbles
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The marble track is located 75mm from the center of the wooden plates

>>Safety warnings: Remember to wear glasses and a dust face mask when using the lathe Machine

Instructions:
   - Attach the top wood plate to the lathe machine
   - Start the lathe machine and carve out the track using the rounded tip tool you just created
   - Stop carving when you have a 6mm depth carved track (use a caliper rule to measure the depth)

   - Attach the middle wood plate to the lathe machine
   - Start the lathe machine and carve out the track using the rounded tip tool you just created
   - Stop carving when you have a 6mm depth carved track (use a caliper rule to measure the depth)

Now you have 2 pieces of wood (middle and bottom plates) with a carved track for the marbles to ride in.

Step 7: The Servo motor housing (bottom and middle plate)

Picture of The Servo motor housing (bottom and middle plate)
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For the motor housing we are going to carve the middle and bottom plates.

Instructions:
   - Place the motor on top of the bottom plate of wood
   - Align the center of the motor axis with the center of the piece of wood
   - Using a pencil draw the outer perimeter of the servo casing on the wood
   - Cut out the rectangular piece of wood in the center using the hand wood cutter
 
   - Place the motor on top of the bottom plate of wood
   - Align the center of the motor axis with the center of the piece of wood
   - Using a pencil draw the outer perimeter of the servo casing on the wood
   - Using a pencil draw the outer perimeter of the servo casing on the wood
   - Cut out the rectangular piece of wood in the center using the hand wood cutter

NOTE: You have also to carve a small rectangular piece on both plates in order to make space for the motors wire to pass through

Step 8: Carving out the wooden Top Plate motor horn housing

Picture of Carving out the wooden Top Plate motor horn housing
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For this step you need to cut the circular servo horn into a rectangular shape in order for it to rotate the top plate

Instructions:
   - Draw a rectangle on top of the circular servo horn
   - Using a hand saw cut out the exterior part of the rectangle

Now we have a costume shaped servo horn, follow the next instruction to make a housing for it on the top wooden plate

Instructions:
   - Place the rectangular servo horn on top of the top wooden plate
   - Align the center of the horn axis with the center of the piece of wood
   - Using a pencil draw the outer perimeter of the servo horn 
   - Cut out the rectangular piece of wood in the center using the hand wood cutter

Step 9: Configuring the Bluetooth Module

Picture of Configuring the Bluetooth Module
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The Bluetooth module we are going to use is called Bluetooth Mate Gold - Class 1 : 12dBm
Any serial stream from 9600 to 115200bps can be passed from your smartphone to your module over 100 meters.

To configure the Bluetooth Module check out this tutorial:  http://www.sparkfun.com/tutorials/67

Configuration:
   - Set the Baud rate to 57600

Step 10: One Stand - Electronic Schematic

Picture of One Stand - Electronic Schematic
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This step is for making the electronic connections between components to create one stand:

The list of components for the electronic circuit:

   - 1 Arduino Board
   - 1 Servo Motor
   - 2 Potentiometers
   - 1 LED's (Red)
   - 1 Bluetooth Mate Gold module

Wiring:
   - Attach the Bluetooth module to the Arduino Board using the following connections:

      - Ground to ground
      - Bluetooth 3.3V pin to Arduino 3.3V pin
      - Bluetooth RX pin to Arduino digital pin 9
      - Bluetooth TX pin to Arduino digital pin 8

   - Attach the position Potentiometers to the Arduino Board using the following connections:
      - Last potentiometer pin to Ground
      -  First potentiometer pin to 5V power supply
      - Middle potentiometer pin to the Arduino analog pin A1

   - Attach the speed Potentiometers to the Arduino Board using the following connections:
      - Last potentiometer pin to Ground
      - First potentiometer pin to 5V power supply
      - Middle potentiometer pin to the Arduino analog pin A0

   - Attach the LED to common ground and to the digital pin 7 (see schematics)

   - Power supply (remember to join a common ground)
      - Power the Servo Motor using a 5V external power supply
      - Power the Arduino board using a 6V-9V external power supply

Step 11: Up to 5 Stands - Electronic Schematic

Picture of Up to 5 Stands - Electronic Schematic
MotorizedStandmadeirafianlmultistand.png
This step is for making the electronic connections between components to create up to 5 stands:

The list of components for the electronic circuit:
   - 1 Arduino Board
   - 2 to 5 Servo Motor
   - 3 to 6 Potentiometers
   - 2 to 6 LED's
   - 1 Bluetooth Mate Gold module

-Wiring:
   - Attach the Bluetooth module to the Arduino Board using the following connections:
      - Ground to ground
      - Bluetooth 3.3V pin to Arduino 3.3V pin
      - Bluetooth RX pin to Arduino digital pin 9
      - Bluetooth TX pin to Arduino digital pin 8

   - Attach the servo speed Potentiometers to the Arduino Board using the following connections:
      - Last potentiometer pin to Arduino Ground
      - First potentiometer pin to 5V power supply
      - Middle potentiometer pin to the Arduino analog pin A0

   - Attach the position Potentiometers from the stands to the Arduino Board using the following connections:
      - Last potentiometer pin from stand 1 to Arduino Ground
      - First potentiometer pin from stand 1 to 5V power supply
      - Middle servo position potentiometer pin from stand 1 to the Arduino analog pin A1
     
      - Last potentiometer pin from stand 2 to Arduino Ground
      - First potentiometer pin from stand 2 to 5V power supply
      - Middle servo position potentiometer pin from stand 2 to the Arduino analog pin A2

      - Last potentiometer pin from stand 3 to Arduino Ground
      - First potentiometer pin from stand 3 to 5V power supply
      - Middle servo position potentiometer pin from stand 3 to the Arduino analog pin A3

      - Last potentiometer pin from stand 4 to Arduino Ground
      - First potentiometer pin from stand 4 to 5V power supply
      - Middle servo position potentiometer pin from stand 4 to the Arduino analog pin A4

      - Last potentiometer pin from stand 5 to Arduino Ground
      - First potentiometer pin from stand 5 to 5V power supply
      - Middle servo position potentiometer pin from stand 5 to the Arduino analog pin A5

   - Attach the LED's from the stand to common ground and to digital pins on the Arduino
      - Digital pin 7 to Stand 1 LED
      - Digital pin 10 to Stand 2 LED
      - Digital pin 11 to Stand 3 LED
      - Digital pin 12 to Stand 4 LED
      - Digital pin 13 to Stand 5 LED

   - Power supply (remember to join a common ground form all stands)
      - Power the Servo Motors using a 5V external power supply
      - Power the Arduino board using a 6V-9V external power supply

Step 12: Carving the arduino and potentiometer housings

This step describes the process of carving the Arduino and the Potentiometer housings on the middle and bottom wooden plates.

Instructions:
   - Using a pencil, draw out the perimeter of the Arduino Board and the potentiometer on top of the upper part of the bottom
      wooden plate.
   - Draw a path for the wires from the potentiometer housing to the Arduino Board housing.
   - Using a metal tool and a hammer, carefully carve out the wood inside the perimeter of the drawings.
   - Adjust the hight of the carved housing in order to fit the Arduino Board and the potentiometer

   - Using a pencil, draw out the perimeter of the Arduino Board and the potentiometer on top of the upper part of the middle
      wooden plate.
   - Draw a path for the wires from the potentiometer housing to the Arduino Board housing.
   - Using a metal tool and a hammer, carefully carve out the wood inside the perimeter of the drawings.
   - Adjust the hight of the carved housing in order to fit the Arduino Board and the potentiometer

Step 13: Attaching the Electronics to the wooden Stand

Picture of Attaching the Electronics to the wooden Stand
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After carving out the wood from the bottom and middle wooden plates attach the electronic components between them.

Instructions:
   - Use hot glue to hold the electronic components and wires to the wood.

Step 14: Joining the Wooden Plates together

Now with all the electronic components attached inside the bottom wooden plate, place the middle wooden plate on top of bottom wooden plate.

Be careful not to squash the wires or the components once you close the bottom and middle wooden plates.

Attach the potentiometer nods to the tip of the potentiometers.

Step 15: Adding the legs to the bottom of the stand

Picture of Adding the legs to the bottom of the stand
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Because the motor hangs out from the bottom of the stand we need to add sum legs to the stand.

Instructions:
   - Attach 4 plastic pins to the bottom of the stand as shown on the photos

Step 16: The Arduino Source Code

Picture of The Arduino Source Code
This step describes how to upload the Arduino source code to the Arduino board using a USB cable

Instructions:
   - Download the Arduino Source Code  
   - Unzip the file to your computer
   - Upload the code to the Arduino using the Arduino software using a USB cable form you PC to the Arduino Board:
      http://arduino.cc/en/Main/Software

Your Arduino Board is now programmed and ready to go.

Step 17: The Android Application

Picture of The Android Application
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This step describes how to install the Android Application in your android device.

NOTE: You have to have at least Android 2.2 or higher running on your Android Smartphone.

Instructions:
   - Download the Android application (.apk)
   - Upload the application to your Android Smartphone using a USB cable from your PC
   - Install the application
  
   Connect to Stand
   - Run the application
   - Turn on bluetooth module as instructed
   - Scan for bluetooth devices
   - Pair with bluetooth device (bluetooth module)
   - Press Menu button and press Control Stand

Now you are able to remotely control the Stands, you can choose to alter the position and the speed of rotation!

   Control the Stands
   - Control the servos speed from 1 to 20
   - Control the motors position from Stand 1 in the range of 0 to 180 degrees
   - Control the motors position from Stand 2 in the range of 0 to 180 degrees
   - Control the motors position from Stand 3 in the range of 0 to 180 degrees
   - Control the motors position from Stand 4 in the range of 0 to 180 degrees
   - Control the motors position from Stand 5 in the range of 0 to 180 degrees

   Disconnect from Stand
     - Press the menu button and select disconnect from Stand

NOTE: You have to have at least Android 2.2 or higher running on your Android Smartphone.

Step 18: The Computer Application (Win, Linux and MAC)

This Application runs on a Windows, Linux or Mac machine using  Java RXTX library.

Please read this following article on how to configure RXTX on Windows Linux and MAC:
http://arduino.cc/playground/Interfacing/Java


These following steps describe the Windows version (COMPORT):

Step 0: 
"Installing" the RXTX on a Windows machine

   - Download the files at http://rxtx.qbang.org/wiki/index.php/Download
   - comm.jar or RXTXcomm.jar goes in c:\...jre\lib\ext\
   - win32com.dll or rxtxSerial.dll goes in c:\...jre\bin\

Step 1: In order to run the Windows Application you need to pair with the Bluetooth module first, this is done by following the next    steps:

   - Control Panel > Hardware and Sound > Devices and Printers

   - Now Select:

   - Add a device

   - Select the Bluetooth device and press next

    - Pair with pin code - 1234

Step 2 : No that the Bluetooth device is paired with you Computer you just need to discover the COM Port.Go to the My Computer icon, right click and select properties

   - Go to device manager

   - Check for the Bluetooth COM port

   - COM18 ( Bluetooth module is associated to the COM18 port in my personal computer)

Step 3: Now that we now the associated COM port, open comand line by typing cmd , than navigate to the file location and type:

      java -jar multistandcontrol.jar COM18

You will now have access to the stand via your Windows Blootooth enabled device

For configuring the "COMport" on a Linux or a MAC please read this article: http://arduino.cc/playground/Interfacing/Java
 
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rickyeatough3 months ago

AMAZING! I LOVE THE IDEA!

So many times i cant be bothered to turn around my monitor or tv!

Great!

aldricnegrier (author)  rickyeatough1 month ago

Thanks :)

seyboy1 year ago
hi sir i am doing the project but i am from ghana and i cant get the bluetooth module in time can you please tell me how i can use wifi to do the connection so that i can use my phone or tablet .. please can you send me the instruction to my email degraft87@gmail.com ... thank you
narker2 years ago
Hey! Great project. I am a little bit of a noob. I am doing a similar project to this, and I have the Arduino and Servo. How do I go about powering the servo?
aldricnegrier (author)  narker1 year ago
Hi narker, sorry i just saw your message today :(

By this time i think you may already know how to power the servo. But here is my answer anyway:

It depends on your servo. If your servo is small and consumes low current, you can power it using the Arduino board.

On the other hand if it is a high torque servo that consumes a lot of current, than you have to power it using a external current source.

I powered mine with the a 5V or 6V transformer that also powered the Arduino board. Just make sure that the transformer can deliver enough current to power the servo and the Arduino at the same time.



willpow19932 years ago
Hi Mobile Earth Explorer,

Great instructable! What kind of maximum weight can these turn? I've been looking at making a controlled rotation device but I was attempting to do it using an old DJ turntable. I kept coming unstuck as the bearings in the turntable couldn't handle the weight I was putting on it (obvious when you think of the weight of a record compared to the 13Kg I was putting on it!). Do you think that your system would be able to manage that sort of weight?

Thanks!
aldricnegrier (author)  willpow19932 years ago
Hi willpow1993,

The wood/marble turntable i built can easily handle 60Kg, i know this because i set on it and it managed to turn me. i did this experiment before i put the yellow plastic "legs". In order to do this, you will need to put stronger "legs" under the turntable, i used plastic pins, you can use some wood cubs for example.

keep in mind that the servo motor i used has 24.70 Kg-cm in torque.

Cheers,
Awesome! Thank you!
You don't really need a bluetooth connection to turn that wood stand. It can be done with a small IR remote and an IR sensor instead of bluetooth adapter. and it's also cheap :D
aldricnegrier (author)  Timofte Andrei2 years ago
Hi there h3x, the idea of this project was to use a smartphone to control the stand, i don´'t know any smartphones on the market that emits an IR signal, so it has to be done via Bluetooth or WiFi. Cheers.
Hi,

This will be the first time I will be using an Arduino board and I will be buying it from a supplier who might not have the exact stock.

Could you please tell me exactly what Arduino board it is I should be buying?

Many thanks
aldricnegrier (author)  sixfootjames2 years ago
Hi there, in this project i used the Arduino Uno Board.

Cheers,
Thank you, that helps plenty!
aldricnegrier (author) 2 years ago
UPDATE: Control Up to 5 Stands at the same time using the Android Application or a Windows, Linux or MAC computer and just one Arduino.

Thanks to all of you for your contributions/ideas, the project is now more complete :)
zvizvi2 years ago
Great project!

I really appreciate the craftsmanship in building the physical rig, and the marbles trick is great stuff. Thanks for sharing :)

Could you also share the Android code?
I am about to go on my first Bluetooth adventure and would love some reference code, as the documentation looks pretty daunting...

Thanks,
aldricnegrier (author)  zvizvi2 years ago
Hi zvizvi,

I have the intension of uploading the code to the Android Market, or better the Google Play, so if i share the code here i loose control on "ownership" of the application.

I recommend you start by tinkering the Android Dev site and start working with the Bluetooth example.

I will eventually release the source code one day ... sorry for this, i hope you understand.

Cheers,
Thanks for replying so quick!
I understand,
although I should say I am sole owner of a few apps that are stored on Google code (public SVN, read only access) and are available on the market - not for sale, though. But anyway that's your choice and it's perfectly fine, the build and the apps themselves are GREAT :))
Cheers,
Zvika
Fik2 years ago
Excellent instructable.
I like the mixture of high tech + woodworking, and the idea of building a wood and marbles flat roller bearing is brilliant (from time to time I have come across a project and get stuck because it uses an expensive / hard to find flat bearing)
aldricnegrier (author)  Fik2 years ago
I could have used a lazy Susan flat barring on the stand, but it wouldn't have been so challenging and interesting to build. Also the lazy Susan flat barrings are hard to find in local hardware stores, i could only find them on-line. Thanks for your comment.
Geedox2 years ago
Great Idea! I remember a Sony TV set in the 80's that turned the Set towards the remote control. Precision was sketchy at best and - I imagine - Weight and power issues ditched the idea at the time. Today's lighter TV's are a different history. Keep it up!
aldricnegrier (author)  Geedox2 years ago
Yup, monitors now a days are "feather weights", thanks for the comment.
Kelpbot2 years ago
Very cool project.
Another interesting path to follow would be to have the rotation automated. If you mounted a webcam to the stand, then you could have it track your face or a brightly colored "tag" attached to your shirt. Then you could program the turntable to turn until the webcam was directly pointed at your face or the tag. That way, if you wanted to walk to the other side of the room for your coffee and you don't have any free hands to operate your phone, the screen would already be facing your direction.

Just a thought,

Kelp
aldricnegrier (author)  Kelpbot2 years ago
Thanks for your contribution Kelpbot, its a great idea!
draco9632 years ago
This is freakin' AMAZING!!!!!

Now, do I HAVE to use an Android device, or would there be someway to make this work in some other wireless manner?
aldricnegrier (author)  draco9632 years ago
Thanks for the comment.

I promised the user offtherails2010 to upload a Java application that will allow you to control the stand via Bluetooth from your Windows, MAC or Linux, so keep tuned in for that update.

Cheers,
Phenominal. Thanks mobile_earth! Can't wait!
mstarkey12 years ago
The Lazy Susan for the 21st century. Great idea.
aldricnegrier (author)  mstarkey12 years ago
Thanks mstarkey1 :)
aldricnegrier (author) 2 years ago
I have updated this Instructable so that you can now control up to 5 stands using a single Arduino. The Android app is also capable of controlling up to 5 stands.
!!! DUDE !!!

Your an absolute GENIUS !!! Youve done it !!!!

Truly AMAZING work and i stand back in awe at this marvel youve upgraded !! totally superb work, rated it 5-stars everytime i visit and im collecting all thats required to make at least 4 of these now, one each for 3 monitors and one to show off my RC Buggy lol !!

Totally Blown Away with your work - You should enter this into a competition if it could fit into a current category from instructables !!!

The best Monitor turn-table idea SINCE SLICED BREAD !!!!!!!!!!


Keep up the most-excellent work !!!!
aldricnegrier (author)  offtherails20102 years ago
" The best Monitor turn-table idea SINCE SLICED BREAD !!!!!!!!!! "

lol :)

Thanks, i am glad you appreciate all the work i have done.
Your most-welcome !

& its a very high-appreciation ! VERY !

;-)
shazy7922 years ago
apply grease to marbles the jig will move way smoother and quieter!!!
aldricnegrier (author)  shazy7922 years ago
Ok i will give it a try and see how it goes. I will firstly treat the wood with wood varnish, let it dry, and than i will apply some bearing grease. Thanks.
shazy7922 years ago
U should grease the marbles it would move extremely smooth!! BTW this is awesome..!


aldricnegrier (author)  shazy7922 years ago
Thanks for the comment shazy729. The wood/marble bearing system works pretty well without grease, but thank you very much for the advice/idea any way.
emunah212 years ago
You've a really nice project, congratulations! It looks very fun :p
aldricnegrier (author)  emunah212 years ago
Thanks, remotely turning the stand is actually a lot of fun, specially when you turn up the speed :)
ABSOLUTELY AWESOME !!!! !!!! !!!!

Just what ive been looking for - FOR YEARS !!!

Although i would have wanted a Remote Control for this but you've gone one step further AND TOTALLY BLOWN ME AWAY with using an Android Mobile Phone to Control it !!!

Well Done and Superb Craftsmanship all-round !!

Unfortunately i dont have even a quarter of the tools needed but am collecting those specific tools so in the meantime, i would very much like to know if this could be used to control 3 Servo's - One servo each for 3 separate monitor turn-tables ??

Would this be possible ??

I have 4 monitors hooked up to my PC and want to make this awesome gadget for 3 of the 4 monitors but could this be possible without wasting 3 separate Arduino's for each monitor turn-table, so run any 3 servo's from one Arduino ?!!!?

Many thanks in advance for any/all help given towards this Goal !

Also Rated 5-Stars before reading this and another 5-Stars after. lol !!!

;-)
aldricnegrier (author)  offtherails20102 years ago
Hi offtherails2010, thank you for the double rating :) and for your comment.

I programmed the Android and Arduino application to run a single turntable, but i can easily modify it to run multiple servo ... that is actually a great idea :)

I will rewrite the application in order to control 5 turntables Max, the user will be asked to chose how many turntables he wants to control before entering the control interface.

After i rewrite the applications, they can function by using a single Arduino, you will have to buy long servo extensions thought :)  You can find servo extensions with 1 meter maximum length online. So you can connect all separate servos to the central Arduino (within a 1 meter radius zone).

Keep tunned in, i will hopefully have the alterations ready by the end of the week.

Once again thanks for commenting and in turn enriching the project :)
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