NEW REPAIRED STL HAS BEEN UPLOADED A holder a bit different then the others... Feels comfy, easy to handle in action (while running, skiing,skating, diving, skydiving etc.) Please don't punch someone with it. (I tested it for you, it does what a brass knuckles does, perfectly) Some countries, its illegal to carry or have brass knuckles, so know your region's laws. For the bolts, nuts and holder design, this guy has it. http://www.thingiverse.com/thing:163883/#instructions Check my other design GoPro Frame for Backpac Or Touchscreen (Hero3/3+) http://www.thingiverse.com/thing:888729Print as seen on render photo. I used 100% infill. It holds your GoPro so it should be durable Use supports