Summary

míght be useful for others as well. To press the M5 nut inside. Put the GoPro or another holding device into the GoPro tripod holder. - heat the M5 nut up - just use a lighter and press it into its place. It should stick there now for ever.

These days everything can be done with the mobile phone - just use my quad lock connection/extension (look at my designs - mobile phone holding device for quad lock xbox playstation pc wheel stand). And you can attach your mobile phone to the tripod ... pla will do there are no forces pushing and pulling the device. To get some feedback would be nice.