Originally I saw shearn's 'GoPro HD Mount with recessed screw hole' mounted on a video light set and I thought to myself 'I really want one of those!' So here it is.
Torch clamps coming soon to a Thingiverse near you
Here is some footage using the handgrips:
definitely helps stabilise the gopro
print in both sections (I used an UP! and scaled the segments accordingly) and also shearn's GoPro HD Mount with recessed screw hole. add 2 SS m6, 1 SS m4, a set of bmx handgrips (colour of your choice) and dive into the drink!