this is a simple tube clamp with M5 interface (with integrated M5 nut)

scad file is attached for any customization

The clearances for the nuts should be fine, but if you want to be sure or run into problems, you can check the right settings using my Nut test rig:
https://www.thingiverse.com/thing:3890138

This clamp is based on
Customizable GoPro Tube clamp with standard or buckle mounts" by knick.
https://www.thingiverse.com/thing:909819