Last night was cloudy, in the end I parked and then told it to go to Saturn without alligning, which it did. There was little or no change in the photos, so I turned tracking off and there was still vibration showing in the photos. To prove I am not set up on some sort of fault line I turned power off completely and got the expected star trails. One of the motors must be quietly humming to itself for no good reason. Will recheck gear meshing and adjust the worm for the RA axis as Barry suggested. If no luck it will go to Brisbane in a bucket for professional help and the children will probably get nothing when I die.
Peter
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