Picture of Hidden Blade
Almost Ezio-quality hidden blade :)

Full costume or 2010 Halloween can be found at the link below:
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Step 1: Ingredients

Picture of Ingredients
This whole blade was pretty cheap. Price breakdown:
  • Drawer sliders (2) @ $3 for 2 sets (Axmans surplus store!)
  • Ring @ $1.50 each (Target clearance shelf)
  • Rubber bands @ practically free...
  • Letter opener (AKA blade) @ $1 each (Office Depot)
  • Cotter pins (2) @ ~$0.20 each (Hardware store)
  • Nuts-size 6
    • brass ones (11) @ $0.09 each (Hardware store)
    • steel ones (~12) as filling on long bolt @ $0.08 each (Hardware store)
    • size 10 brass @ $0.25 each (Hardware store)
  • Washer
    • size 6 (8 of them) @ $0.08 each (Hardware store)
    • size 10 (8 of them) @ $0.08 each (Hardware store)
  • Bolt
    • tiny size 6 (8 of them) @ $0.08 each (Hardware store)
    • 2" long size 6 @ $0.08 each (Hardware store)
  • L-brackets (8 of them) @ special discount, I got 100 for 35 cents :)

That adds up to about $10.50
Not bad!!!

Step 2: Assembly step 1

Picture of Assembly step 1
Grab one of the drawer sliders and slide it as far apart as it will go. Measure on your arm about how long you want the casing of the hidden blade to be. (mine is about 7~9 inches, i forget exactly how long).

Grip the slider firmly and saw off the extra slider (the wider part)

You should be able to slide the thinner slider part out of the wider one. Do so. We are going to throw away the thinner part, but first we need to get the other smaller piece attached to it.

Bend down the piece shown in the 3rd picture with a pliers. Carefully (and close to the ground) slide off the piece with the ball bearings. Keep this piece along with the ball bearings.

Refer to picture 5 to see what we are keeping.

Go to next step.
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can u sell me two of these i honestly will send you mony please respon
Green X10 months ago

nice I could use this

Hi there,
I was just wondering what kind of drawer slides you used, and whether you have any links to websites where I could buy them.
Onyx Ibex (author)  ThePokefan1012 years ago
I would try looking locally as it will probably be cheaper than online (shipping). You are looking for something like this (amazon). The other reason I would recommend shopping locally is that you get to actually see what you are buying. It can be hard to tell online what you are buying a lot of times. Although I'm sure you know all of this already. No promises that that is the right drawer slider, but it looks right to me in the picture and is the right length. Good luck!

i would really like to make that but i cant because im in greece.if i could i would buy 2 of those for the double price

regby2 years ago
How does it retract????
pokemech regby1 year ago
I believe it's just gravity, the lock connected to his finger opens and he holds his arm down to extend it, then he loosens his hand to close the lock. To retract it, he holds his arm up and releases the lock, then locks it again once it's in.
jamez19981 year ago
thanks, still working on it, i'll finish eventually
You can also make the 'key' sideways to get a slimmer design
Thanks! Having a hard time, but I'll get it eventually!
didibemi1 year ago
VERY NICE. I just loved your instructable and I'll be doing it this month. Perfect, for real!
Slrman2 years ago
Ideal for a terrorist neophyte. As usual, the TSA would be helpless against this. But they are mostly useless anyway.
kramerllama2 years ago
I feel like you could use a smaller U bracket and smaller bolt for this step, and would reduce much of that clutter from the nuts.
I think im gonna try a double spring action so its auto in/out...ill let everyone know how it goes
amcmorris12 years ago
I've been trying to make a hookblade (without the blade) for ages, I would use it as a climbing hook for Parkour.. can someone give me some help?
Onyx Ibex (author)  amcmorris12 years ago
you mean basically a crowbar shape? but lighter I assume. Were you thinking retractable? if you let me know a few more details such as the length desired I could draw and send some designs to you if i think of anything. As a separate suggestion, I have had some success in pursuits by using poles with a hook at the end (8 foot long poles) and grips twisted into the pipe. The pole allows you to vault, swing and hook assuming you can climb a thin pole and know how to vault. It comes in quite handy and allows you to reach many inaccessible places. The downside being that it isn't concealed easily...
Dr.Ike2 years ago
You could probably use a pen tube instead of all the nuts.
Onyx Ibex (author)  Dr.Ike2 years ago
ideas like that are why I love ibles
ezra01282 years ago
is it retractable
Onyx Ibex (author)  ezra01282 years ago
Naitsirhc4 years ago
Is it wise to be instructing people on how to build concealed weapons? What happens when this technology makes its way into our schools? Seriously. Many schools already have security and metal detectors. One kid gets stabbed by a weapon like this and instead of starting the day with the Pledge of Allegiance or kids are going to be starting the day with a morning TSA Style Pat Down.
dude, I think that any kid even if they are stupid wouldn't be that stupid.
you are underestimating just how stupid, stupid kids can be.
yeah, but you are assuming that most kids will take the opportunity to stab their enemies in a school. Not the case. If a kid is going to be stupid or try and stab someone, not knowing how to make and assassins creed style blade will not stop them. A regular old pocket knife will do. Or a chair. Or a pencil. Or a gun. We are surrounded by weapons, some more potent than others, and we have to trust one another enough to assume we won't be stabbed at any given moment....
Yeah its true if a kid is pushed to the edge and they snap they might try to get that kid with anything they have at there disposal, but many kids will bide there time, take time to make a hit list and that kind of stupid thing. Kids can have a flair for the dramatic. You can't tell me that the Columbine kid wasn't thinking about "The Matrix." when he shot up his school.
It doesn't matter if a kid is going to take their time or not... There are many more instructions for making weapons all over the internet. Complaining about this one specifically isn't going to do anything to hinder the hundreds, even thousands of others that are posted all over the web.

If a kid is stupid enough, and angry enough, to want to kill others, you can't blame the people who are teaching others to make weapons. Knives, guns, and any other kind of weapon DON'T kill people. People kill people. Someone with the intent to kill others is going to find whatever way to do so that they can, with or without the internet's help.

As far as your comment about The Matrix goes, maybe he was, and maybe he wasn't. The point is that it isn't the media that is killing people. Games like Grand Theft Auto or Saints Row aren't telling people that it is okay to kill others. The only kids that will be "stupid" enough to start having thoughts like that are kids who have some kind of mental instability. There are far more normal, non-violent children than psychopathic potential murderers in this world.
I think you're over estimating our stupidity.
lunius Ringley4 years ago
Exactly. Many people who view this may be like me, wishing to make a prop version for recreational use. My Parkour group is beginning to lean towards an Assassin's theme, and making a paper or cardboard blade like this would do wonders for our demo videos.

I have seen much worse stuff than this on the internet.. I can tell you how to make napalm at home for roughly $5 per gallon, I can show you how to make an RGD-5 Hand Grenade, how to dig and cover a pungee pit to match the location. I can tell you how to make a throwing knife out of a blank CD, and a caltrop out of needles. I can build a small forge and forge knives with old soda cans. I learned all this from the internet, and have not ONCE seen ANY of these employed in a school. At my high school, there have been bomb threats and gun threats, and many kids carry knives for their own protection, but not one of them would bother attacking someone in a place with cameras and police officers.

Even mentally unstable people have a basic grasp of common sense.
Its not like he's teaching them how to make a shank. Hes not teaching them how to make a weapon specifically to shank someone. Besides, If a kid tried to shank someone at school. why make this. They would use a pencil instead anyway.
Start the day with the Pledge? I start third hour with the Pledge.
The internet teaches makes technology far worse than this readily available to anyone with an enabled computer. It is (arguably) a drawback of the internet. But it is a reality. Information is becoming free, and responsibility is becoming more and more personal. Complaining about it won't change it, nor will anything else. Take steps to adapt to it and move on is my philosophy. If you do not want to view such content, or do not want your children to view such content, you have the ability and responsibility to block sites and monitor internet activity until your children are responsible enough to make their own decisions.
Alaap3 years ago
use a strong spring to make it retractable so that when you let leave the ring loose the blade will retract
aweis Alaap3 years ago
well the problem about a spring making it retract, how will it get out, and if you think just haveit so the spring will not hook till it opens, then it will not open again afterwards.
mrmerino aweis2 years ago
Use a thin rubber band or weak spring, and flick your arm on pulling the catch.
Is there something else that I could put in place of the letter opener? Just to play it safe you know.
You could use a nail file, but the letter opener I got had a rounded tip, and even if I tryed to stab through something it would push back and move the cotter pin over it.
thats why you should use your hand to hold it in place by attaching it with a copper wire.....
A pole with a flag saying 'BANG!'
The letter opener should have a rounded tip. If not you could just selotape a draw slider to your arm?! :)
Techie_Gary2 years ago
I had a better one. if u use a mechanical lock, there may be a chance that the locking system would fail so instead, you use your own force by attaching your ball-bearing slide with a copper wire and make a hoop large enough for your thumb to pass through in the other end of the copper wire....... just like holding a dagger yourself.....
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