Ever since I first played this game, I've wanted one of those sick hidden blades like Altair has. Well, in this Instructable, I'm going to show you all how to make one for next to nothing.
Here's a look at a very detailed drawing of the one from the game: http://img.qj.net/uploads/articles_module/64010/assassin3_qjpreviewth.jpg
Originally, I got the plans from Wesley Scoggins on IndyMogul.com. I modified it a little, but kept the same basic structure/ provided more detail. Here's the website if you want it: http://www.indymogul.com/post/7272/wesleys-weekly-how-to-retractable-wrist-blade
Here's a video of it in action:
Let's get started!