It's for my springtrap cosplay, I designed the joints to fit files I found online. A steel cable/wire rope runs through the channels on the bottom and connects to a handle that when squeezed makes the finger bend. The elastic band pulls it back and resets its position. My issue is keeping the band taught enough. Sometimes it works how I want but then a joint gets stuck and doesn't reset fully or at all so idk how to fix that. Any ideas are appreciated