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Well re-tuned the mount today. No sign of sky tonight so I won't know how it went.
Did find one problem though, the Dec motor wasn't engaging the belt properly. There was backlash between the motor and the worm gear. This was serious as you can't resolve this by weighting the mount and thus would explain the problems with Dec backlash.
I still have a tiny bit of slop between the worm and the main gear, but that can be taken care of by weighting.
Looking forward to another clear night. I want to test my software theory. I'll guide one night using remote desktop and another night using teamviewer and see if I can see differences.
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