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Hello Wayne,
My CGEM has a lot of backlash in the DEC motor. To compensate I guide in one direction only for DEC. This adjusts for any DEC drift due to polar alignment errors. When your DEC isn't perfectly balanced you'll probably find that your guider may also be guiding in one direction only to take up any drift. When it is well balanced it probably oscillates a bit due to over-guiding and backlash.
Regards,
Tony.
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