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100s is not bad at all at 600mm FL for any budget mount. I don't know the worm cycle for an EQ6 but it is unlikely to be Polar alignment. May be PE but more likely wind or stiction or other mechanical issues. To do long unguided subs you need a high end mount with small PE. You're better off starting to look into auto-guiding to avoid heading into a world of pain. That's the easiest and cheapest way out .
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