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Pulled it apart today. Two internal screws had fallen out! Perhaps I never tightened them last time, but they do only catch by a few threads. Replaced and tightened all three, rebuilt, adjusted the Az clutch so it locked more surely, and tested the motor drive. OK, seems it is all working now. If these clouds clear a little, I'll check it out on the stars tonight. I recently cleaned the secondary and primary mirrors. Not by the textbook - I tapped the corrector plate mounting and popped the whole lot off! OK, no problem, I could get at the mirors so a gentle wash etc. Forced the corector plate mount back over the tube and firmly forced back into place - seems very secure but I must watch it as the scope heats and cools. So I expect collimation to be way out now.
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