Problem: we found the hard way that the bellows will allow only a very limited tilt of the mirrors corresponding to a maximum height difference of +/- 2.5 mm of the downstream mirror jacks. Hence additional hard limits were added that limit the relative height difference of the jacks, whereas the absolute stroke of each jack remains at +/- 12 mm.
Limit lines for each motor driver were kept separate to avoid ground loops. Hence the relative height limits consist of two piggy-backed limit switches each, for example RelTopFront/RelBotRear.
