How to Make a hidden blade from Assassin's Creed with a metal bearing rail

The hidden blade that Altair uses to murder his victims in Assassin's Creed is a great costume piece, and if you don't mind working with metal then you should be able to use the instructions in this video to make a really cool one.

From the Creator:

1. A ball bearing slide (mine was 25 cm / 10 inch)

2. A hack saw or other tool to cut metal

3. A nut and a bolt

4. drill bits (one that's 1 or 2 mm for the spring holes, and one to cut a hole for a nut and a bolt. The size of the drill depends on the size of the bolt you are using)

5. Rivet + rivet gun

6. 2 springs (a long one, and a short one)

7. Solid copper wire (I used it to make the weird 'unlock' mechanism shape)

8. A ring (a keyring is the best solution)

9. A string

10. Soldering iron + soldering equipment

Additional files / information:

Ring Activator