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Odd behaviour going on there. What do star shapes look like Peter?
Some observations though. If your PA is good then you will hardly ever need to make corrections. I find normally I get movement in RA due to PE and nill if any in Dec. The RA movement is very minimal so I would be looking at .25 of a pixel off the center line.
Just really take the time to check balance over entire sky. You might have something odd going on. Probably not but worth checking. Goes back to the conversation we had last Saturday about hunting for issues.
Is the Dec truly locked off. Does the dec need locking knob need some adjustment? Most likely not, but worth checking.
Cables need lots of attention, grabbing can cause this issue.
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