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Providing your PE is even and is not subject to sharp spikes, your autoguider should be able to handle it without being trained.
Probably the best way I have found to handle PE is to weight your OTA slightly to the East, ie if the tube is on the western side pointing east, slide your counterweight down very slightly, if your OTA is on the eastern side, slide your counterweight up slightly, this keeps an even weight on your worm and it is in constant contact. If you balance too finely, your worm can occilate slightly causing your stars to elongate slightly if there is a lot of play in the gears.
As already said, set you backlash to zero, PHD will do a check on your backlash and compensate accordingly.
Cheers
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