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This is normally due to bad drive training results.
Ie when you finish a slew, and the scope needs to reverse direction, the scope slews at approx 2x sidereal to account for the "theoretical" backlash before reverting to normal tracking.
If you are overtrained, it will effectively slew too far whilst applying the expected lash, vs the real lash.
What are your current drive train/backlash numbers?
( not percentages, but drive train values )
Andrew
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