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I spent some time on this last night, even sanded down a couple of Spacers but that didn’t work. I think I have found the cause of the problem however. When I released all the tension bolts on the Middle Assembly the rocking disappeared. Tightening Tension Bolt B (the long 5″ one)_ seems to be the culprit but Tension Bolts C also to some extent. I didn’t have these extremely tight to begin with, no cracking plastic sounds!
I need to re-tension the Middle Assembly but can’t seem to get it right. I can get all the bearings engaged except for one in the lower XYZ (see attached pic).
I am trying to tighten the bolts just enough so that none of the XY or XYZ parts can move and get the XYZ bearings engaged. XY bearings are fine, easy to tension but that last XYZ bearing is a bugger.