Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3976027. Here's a very simple GoPro mount that I spent a few minutes designing. It is intentionally very tight on the camera bracket. Requires an M5 bolt/nut to hold camera in place. I recommend pre-applying double-sided mounting tape on the bottom so it can be mounted where you need it, when you need it.