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Thanks Joshua.
I've been experimenting with more modifications of the secondary focuser. I changed the spring-loaded nut mechanism to a floating nut solution that decoupled it from the mirror carrier plate. It works beautifully but the tilt hysteresis remained the same, unfortunately. But it occurred to me that there is a software solution to this problem. Any loaded motion system suffers from backlash and hysteresis but a proper anti-backlash routine can deal with both problems. So on the short run I will leave the front end as it is and I will start testing the optics on the stars. For that I will have to 3D print a temporary box for the full version of the myFocuserPro2 controller. Eventually I intend to make my own controller that also deals with thermal management.
Initially I won't be using autofocus software so I made a Bahtinov mask for manual focusing.
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