This is a kit i boought off ebay recently; I've managed to work on these and somewhat complete the left gauntlet. It just needs some touching up but otherwise it's upon completion. However, I've run into a snag with the bladed gauntlet; I want to make it extend and retract but I'm having difficulty trying to devise some kind of spring loaded extension system to make it work but am having problems doing so. I'm not very knowledgable with springs, pulleys or what not so can anyone here through out some ideas to help me out? It would be greatly appreciated!!!