Hello everyone! I'm making a costume of a game character and I think I need some guidance regarding the mechanical aspect. I asked this question on a cosplay site, but they suggested I might get more help here. So I'm going to cosplay this character on an anime convention: Spoiler: Pictures As you may have guessed, I need help with the blade mechanism - I want to attach a string to my fingers which I would pull with the thumb to make the blade "unfold". By default, a spring would hold the blade as it is on the first picture, but the more I pull the string, the further out the blade will go (about 60 degrees max, I think, like on the 2nd picture) First I wanted to make the blade wooden, but I didn't want to injure people if I accidentally catch it on somebody, so I've decided to make the blade out of crafting foam or cardboard. That way it won't be too heavy, so we don't have to take a lot of weight into account. I'll also prefer the blade to be detachable so that I can change it, because considering the material used, there's a relatively high chance it will break on the con (crowded places and stuff). So now that I've described the project, I'd like to ask you guys what's the best way of doing this, to keep it relatively small and most importantly, close to the original. Is there any way to go about it without visible springs? What kind of hinge should I use here? I know I could probably figure this out myself, but I really can't afford spending too much money "experimenting" :( Thank you for your time!