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I use SGP all the time. I use Sharpcap when i need to do field polar alignment quickly, but for image capture i always use SGP. Re the fan, when at rest it could be fine, but when powered up it may rise on its bearing and strike something or be out of balance due to uneven plastic casting tags. Like a propeller it will dig into the air and want to draw itself forward so it is entirely feasible it would appear fine when you spin it by hand at low rpm.
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