User blog comment:DragonBlade1/Hidden Blade/@comment-2150480-20100709132707

Anon's got a point. Switchblades and similar devices/tools are forbidden in many countries and restricted in others. All you can do is make one yourself (though I think that would also be illegal to have). The closest you can get in not-making it is to see a design of a Hidden Blade someone has already made and then make it.