"For the spindle you also have to find the exact limit height where the magnets don't support the platter anymore and where the effort is done by the ball itself."
This is not the correct procedure for using the ball according to Verdier. The ball should not be supporting the platter, that defeats the intent of the magnetic suspension system, and results in a very high load on the ball with resultant drag/rumble. The idea is for the majority of the load to be taken up by the magnets, with only a very small portion carried by the ball itself. You adjust the spindle height until you can just feel the ball touching the underside of the platter, no more than that. In this way, you maintain contact from the platter through the ball to the spindle/bearing support, yet there is very little actual load on the ball. What you describe, would certainly overload the ball over time, it seems to me.
This is not the correct procedure for using the ball according to Verdier. The ball should not be supporting the platter, that defeats the intent of the magnetic suspension system, and results in a very high load on the ball with resultant drag/rumble. The idea is for the majority of the load to be taken up by the magnets, with only a very small portion carried by the ball itself. You adjust the spindle height until you can just feel the ball touching the underside of the platter, no more than that. In this way, you maintain contact from the platter through the ball to the spindle/bearing support, yet there is very little actual load on the ball. What you describe, would certainly overload the ball over time, it seems to me.

