Allows direct use of go pro harnesses and whatnot.
I used a ¾" length bolt, but had to cut it short on my attempt; probably would work better with ½".
The parts that interface with the GoPro clip required moderate sanding to fit.
If the bolt does not fit through the whole, heat it for a short time on a stovetop or other flame (carefully with a pair of pliers or similar) and press it though.
The author remixed this model.