Logitech Ergo Fixed base

This model is an evolution of https://www.thingiverse.com/thing:2841421#Summary
First of all, Thanks for sharing it.
I added:
* Hole and stick to remove the ball.
* The holes to insert the ferromagnetic plates are replaced by circular ones where, by pressure, two 0.02€ coins are fixed,
My apologies to those who do not use euros or credit card ;). The 2cents coins have a slot in the center of the edge, which is ideal for them to be placed without any adhesive. They are ferromagnetic.