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One piece of advice for GSO dob owners would be to mark the tube and mirror-cell holder with tape or something so you put it back in the same position (rotation).. after much wailing and knashing of teeth I found my OTA and/or mirror assembly is not perfectly round and it would only fit back properly in one position (ie I had to keep rotating it until I found the position in which it would slide properly onto the bottom of the OTA. a bit frustrating at the time).
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