Base plate for cheap pan+tilt servo bracket mount with heavy camera

Another model bracket adapter made cheap pan+tilt servo bracket adapter work with heavy cameras (55g), and that was fine in most cases:
https://forum.prusa3d.com/forum/english-forum-awesome-prints-hall-of-fame/making-cheap-pantilt-servo-bracket-mount-work-with-heavy-camera/

But moving camera very far up resulted in instabiltiy. This new 80mm radius plate has 4 holes for the screws from cheap adapter. Holes are bigger on downside to allow the nuts completely hide inside. Videos of PTZ camera and camera watching the scene can be found in the thread.