Originally Posted by
442dude
The clamp on the handlebars rotates. It came with various inserts but they slid even more than the gaff tape...They were more plastic than rubber - I wonder if I made a couple of rubber ones if they would work?
Okay, I think I know what you bought. I modified two sets of them to mount an external battery pack for my GoPro with the GoPro mounted to the battery. Both handlebars and battery are the same diameter, give or take a few tenths of a mm.
What is the diameter of your handlebar? I don't use any plastic or rubber inserts on mine and it clamps down tightly.