hi paul,
thanks for the detailed reply. I was looking through your suggestions when it happened again and then I realised as I was manually slewing with my hands that the scope was not balanced very well at all. I had balanced it a fair while ago but things must have gotten out of whack.
So I parked it, and redid the balancing again from scratch. This time it worked ok, so it must have been too heavy on one side and thus was causing the gears to slip as you were getting at.
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