Summary

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/9cRRR9lzyVN

New Version 2! Now without glueing.
You need some tapping screws 2 and 3mm and M3 with nuts.
The best is, to print it in ASA.

2020-02-21 cam_in replaced. Better roundet corners