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I've done the backlash testing this morning and, just as Sean suggested, practically all the backlash is coming from the EAF reduction gearing.
With a small load applied to the focuser and trying to rotate the flexible coupling back and fort, I measured a backlash of about 60 microns, corresponding to about 15 steps.
However, there is so little friction in the actual focuser, that even a small loading gets rid of the backlash. Under a load of about 1kg, I was getting the best result with a backlash setting of 1 step.
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