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When I have in focus issues with my Skywatcher collapsible dob I just lower the top OTA cage by an inch, tighten the screws then collimated. It used to be an issue for me with coma correctors and things like that. Not so much any more since I replaced the rubbish stock focuser with a lower profile gso 2 speed focuser. Which is surprisingly good. Can handle at least 1.6 kilo's of corrector and eyepiece without problems.
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