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OK here's the update
at least to me it seems a mechanical problem
I looked at a star through a 12 mm eyepiece while I used the 4 directional keys
when I used the left horizontal, I found the star still continuing to drift even after I stopped pressing the key
I am autoguiding right now -set the anti backlash Dec positive to 55-but it is still gently drifting-over a thirty minute period
(all other anti-backlash set to zero)
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