Print your own thumb screw for Gopro.
Match the Gopro accessories.

The design is for 30/35/40/50 mm long M5 screw with hexagonal head.
The first screw insert need to be done with power (or just tighten it into an open nut).

Notice that the 30 mm screw is too short for use as the camera screw (the 35 mm version might be as well, I haven't printed it yet), the 40 and 50 mm are fine there.
The 40mm version is in the size of the original screw