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Ahhhh, the dreaded 'B' word. Can only say a couple of things here, adjust the worm mesh and backlash so they work together, you will never get rid of it, place a slight amount of weight so to works against it and, if it is the Digital Drive, adjust the TVC setting to about the middle and experiment.
On the ST-4 you can use 'Calibrate' so the guider learns, don't know about other SBig camera/guiders though, will probably have this feature. Works fine on my mount.
JohnG
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