I made this for a costume I want to make because I feel like it. I found PracticalSolutions made the hand and finger segments, so I decided to "give him a hand" and made the wrist segment. The big piece is to be connected to the small rectangle bugger with the arrow pointed to the arm and connected by elastic bands. the pin goes into the file from the source, called "C1+M1" from the source. This is retrofitted to my arm, so you may need to scale it. happy printing, and for legal reasons I feel like I have to say that this is inspired by the Gunslinger item from Valve's Team Fortress Two. (Can never be too safe)