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Assassin's Creed Hidden Blade - Functional Prop!!

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In this Instructable I will be teaching you how to build a working replica of the Hidden Blade from the Assassin's Creed video game series. Don't be intimidated by the number of steps involved, this is a fun project that should only take you a few days in your workshop and should only cost you around 30 or 40 dollars. 

My Design Goals for this Project:
  • I wanted the Hidden Blade to be functional, (to either extend or retract by moving my hand or wrist).
  • I wanted it to look as nice as possible and as real as possible.
  • I wanted it to be easy to build.
  • I didn't want it to require a lot of special parts or tools.


The process of making the Hidden Blade can be broken down into two main parts:
  • Building the blade mechanism (Steps 2-6)
  • Making the Leather Bracer (Steps 7-13)

Materials:

Hidden Blade Mechanism Materials List:
  • 16” Drawer Slide – This will be what holds the blade and allows it to extend and retract.  You can purchase this from home improvement stores like Lowes or Home Depot for about $6. It is important that you get exact same one that I used otherwise the measurements won't work out properly. examine the included picture for product details.
  • Replica Blade – I used a replica WWII dagger for this. the measurements of the blade are 10.5"long, 3/4" in width at the widest point, and 1/8" in thickness. These measurements, especially the 1/8" thickness, are important because there is not a lot of clearance between the moving parts of the hidden blade so be prepared to do some file work to make things fit. To get the blade, dismantle the dagger and discard the handle, pommel, and cross guard components. The blade I used came very dull with smooth rounded edges, if yours is sharp or pointy I highly advise that you sand away the edges so that they are nice and dull, this will make it safer to use and may keep you out of trouble. Cost $12, purchased at local flea market.
  • Small Coil Spring – This spring will be what retracts the blade when it is extended.  It needs to have very light pull strength and should be 3 to 4 inches in length and approximately 1/4" in diameter.  I purchased mine from Lowes home improvement store as part of a variety pack of springs for around 3 dollars.
  • Flat Spring – This will hold the blade in place when it is extended.  you can make this component out of an hacksaw blade, simply cut off a three inch piece of the blade and grind away the teeth.
  • Assorted small nuts, bolts, and washers – The size of the nuts, bolts, and washers doesn't really matter, anything around 1/8” will do fine.  You’ll just have to drill your holes based on the size of bolts you are using.
  • Small Nails – These will be cut and turned into rivets to attch the blade lock in step 5.
  • Rubber Washer – when the blade retracts it retracts with a lot of force, this will be used to dampen that force i.e. shock absorber. you can purchase rubber washers in various shapes and sizes at hardware stores, you do not need to have the exact one pictured, just something similar.

Leather Bracer Materials List:
  • 2 square feet of 5 or 6 oz. leather – This can be purchased at leather suppliers such as Tandy Leather, however you can also use leather from an old suitcase or coat to cut down on cost.
  • Leather Dye – For coloring and finishing your leather, if you use repurposed leather from an old suitcase or coat you won’t need this.
  • Button Snaps – These can be purchased from retailers such as Tandy Leather or Michaels Crafts.
  • Rapid Rivets – These are used to attach the blade mechanism to the bracer. They can be purchased from Tandy Leather or Michaels Crafts.
  • Ring – Pick something that fits either your middle or ring finger.
  • String/Cord – Pick something strong but light, kite string or the inner strands of paracord work very well.  You’ll need about 1 foot of this.

Tools:
  • Dremel Tool and Metal Cutting Disks – You will use these for cutting and modifying the draw slide parts. If you don't have access to a Dremel, you can also use a metal hacksaw for the cuts.
  • Files and Sand paper – For removing sharp edges left by Dremel cutting disks.
  • Drill and Drill Bits – You can use a hand held drill or a drill press, both work well.
  • Wire Cutters – For cutting your spring to adjust its strength.
  • Screw Drivers – Installing screws.
  • Metal Center Punch - For marking where you are going to drill holes on the drawer slide and blade.
  • Hammer – for peening down rivets.
  • Xacto Knife/Utility Knife – For cutting your Leather.
  • Paper or Poster Board – For creating patterns for your bracer.
  • Leather Working Tool (Beveler) - This tool is used to create the Assassin's Creed symbol and designs on the leather bracer. The one I used is known as a B60 Craftool Beveler Stamp and is available from Tandy Leather for around 8 dollars. 
  • Awl/Drill/Leather Hole Punch – Some way of putting holes in leather.
  • Ruler – Creating patterns.
  • Pencil – Marking patterns on leather.
  • Permanent Marker - For making patterns and cut lines.
  • Safety Glasses - Always wear eye protection when drilling and cutting the metal parts of this project.

Disclaimer:  Please use common sense when making and wearing this prop.  If you have any concerns about the blade material feel free to replace the steel blade with a wooden or acrylic analog.  If you're planning to tackle this project then you most likely already have all the skills necessary to make whatever changes you deem necessary to make this prop suitable for your specific situation and needs. Be safe and be smart!
 
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JakeS68 days ago

Could you give a little more information on what kind of rapid rivets you used? Like, what is the length, cap, and base? Tandy Leather sells four sizes,

X-Small: length 3/16", cap 1/4", base 1/4".

Small: length 1/4", cap 1/4", base 1/4".

Medium: length 3/8", cap 3/8", base 5/16".
Large: length 1/2", 3/8" cap, base 3/8".

An answer would be greatly appreciated!

khoalaboi14 days ago

can someone send me the download link and pdf please? I would very much appreciate the AC fans out there, thank you!

my email is seekwah1@yahoo.com

if you could be so kind and send me some measurements of the whole thing if you made the first slide 8 inches instead of ll.5

Matt2 Silver (author)  skyrimplaier14 days ago
What your asking is a bit tricky, every other measurement is dependent on the length of the outside slide and each of the original measurements was derived through trial and error based on the 11.5" length. So I'd basically have to make a brand new mechanism and go through the whole trial and error process again to come up with the measurements for the reduced 8" size. It's doable, but sounds like a better project for you than for me : )

would i still be able to follow some of the other step in this tutorial just figure out the measurements on my own right

is there any way you can add a lock to the back so it doesnt just fall with gravity

HenryP23 months ago

i am from england and i really want to know where i could get a drawer slide eg a web page that might be useful

Have you tried at Wickes? http://www.wickes.co.uk/search?text=Drawer+slide

Matt2 Silver (author)  HenryP22 months ago

I'm not sure HenryP2, I'd suggest checking out the forums as one of the other UK members might be able to help you out.

davidsnik 20 days ago
hi matt can you write the link of the drawerslide down in the comments because i am not really sure where i have to get them.
NicollasA23 days ago

I want to buy at a store or online I need help to know the measurements.

JustinP53 months ago

what was the tension of the spring please?

Matt2 Silver (author)  JustinP53 months ago
Hello Justin,

That darn spring can be such a pain in the but to find. Lowes use to have a variety pack of springs that included one with just about the perfect tension for the hidden blade but for some reason the packs don't include that spring anymore. I have found that the springs used on decorative plate holders (like for mounting a fancy plate onto a wall for display) work pretty well for this project. They are long, have a fairly light pull weight, and the best part is that each plate holder comes with 3 or 4 springs so you have extras. you can but decorative plate holders at places like Walmart or Michaels Crafts.
Hope that helps, I wish I new the exact tension of the spring for you but I'm afraid I don't. (you may also want to consider a rubber band, I know it isn't as attractive looking as a coil spring, but it would give a very light pull and they are easily available, plus it's easy to find replacement rubber bands.)
Best Regards,
Matt

But would a rubber band generate enough force to pull back the metal blade when your arm is pointed downwards?

ChristinaD12 months ago

How do you get the blade to extend? That part was unclear for me when watching your video.

Look at 0:11 of the video.. You have to pull the flat spring via the string WHEN your arm is pointed downwards so as you pull the flat spring, the blade becomes free to move out due to gravity and as it extends down, the flat spring locks it at the hole at the end of the blade..

Does it only retract?

Yes. It extends by gravity i.e. the HB must be pointed downwards to extend it but it retracts because of the coil spring..

JaredG1 month ago

Is it possible to put the blade on the inside of the leather bracer to make it look less conspicuous?

Yes of course! The best feature of this hidden blade design is its simplicity and effectiveness.. You can easily modify the HB as per your requirements.. I know I'm not the one who made this but I did try the HB design by ImDeePainReborn.. His design was more realistic and effective but more complicated too, so I wasn't able to complete it..

lane441 month ago
High Matt 2 silver . If you could I would like you to make 2 pairs if 2 hidden blades each how you made them on your video n and I would pay for both pairs and I would like them fit a 14 and 15 year old

and dude can u stop spammin him i made like 30 of these its posible just make it your self dont keep buggin him what if you got like 18 of the same comments it like the past 2mins i bet it would bug you man just saying

lol u said high instead of hi lmao

lane441 month ago
Hi Matt2 Silvers . Could you make 2 pair of 2 hidden blades each like you did in your video and I would be willing to buy them for however much if you can . My email is lanecarter68@gmail.com
lane441 month ago
Plus make the gauntlet longer to cover it up . I will pay a lot for them if that is what you would ask
lane441 month ago
If you would be willing to sell a pair then could you make them fit a 15 year old have the blades and slide covered to make it look less conspicuous
lane441 month ago
Matt2 Silver . Would you be willing to sell a pair of 2 hidden blades
ChristinaD12 months ago

Still very cool

Tkdman0002 months ago
What are the exact measurements of the coil spring you used?

this is my email shayan.shourabi@gmail.com

this is my email shayan.shourabi@gmail.com

hi matt please send me pdf file i cant pay for pro member i'm a real fan of assassins creed and i really want to make this blade please!!!!!!!

hi matt please send me pdf file i cant pay for pro member i'm a real fan of assassins creed and i really want to make this blade please!!!!!!!

nichg2 months ago

can you be more clear on attaching the blade to the slider and can i make the sliding rail shorter i'm younger and dont have as long arms

guys i want pdf file and i'm in iran and i cant pay for pro member please send me pdf please i want to create this!!!!!! Shayan.shourabi@gmail.com

miguel.yulo.72 months ago
nichg2 months ago

can you tell me the exact brand or model for the drawer slider.i want my blade to function properly to the provided instructions

nichg2 months ago

can I use custom Velcro straps instead o leather greaves. I intend to make the hidden blades from assassin's creed black flag

JustinP53 months ago

what keeps the hidden blade part from falling out of the bearing track

Matt2 Silver (author)  JustinP52 months ago

Well there are a few things that keep it in place. on the front end, the blade lock engages which keeps the blade extended but also keeps it from over extending. And on the back there is the custom bracket that the coil spring is mounted to which keeps the blade from coming out the back end.

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