User blog comment:DragonBlade1/Hidden Blade/@comment-2150480-20100710075926

Well, if anyone needs a little tip for building a Hidden Blade: Try not to make the in and out part of the blade complex - gravity and arm force can sort everything out. What you need to do is the lock that would work perfectly and based on your hand movement (that's the exact tip you should use for building an AC1 Hidden Blade). To build the AC2 Hidden Blade is a bit harder, since it uses a very complex mechanism. Too bad Ubisoft hasn't released any blueprints/design drawings of how the Hidden Blade is made, how it works and which parts it needs.