Just drafted this up.

My GoPro Session cameras (the cube shape) are getting old, but I really don't want to go the boxy rectangle of the newer ones. So I decided to give a cheaper cylindrical camera a go, but was not happy with the cheap mounts which also only really allowed for a handlebar location.

I managed to find a GoPro to flashlight mount on Amazon, but it was designed around a 20mm flashlight body. The camera is 30mm, so whilst it did attach, it was a stretch.

Below is effectively a duplicate of that Amazon sourced mount, but upsized for a 28-32mm cylinder size.

Hooks are for bungie O rings. Thin section in the centre allows for some spring in the mount for different sizes.