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If it is a Skywatcher/Saxon dob maybe you have fallen into the trap of using the black 2"eyepiece adaptor. It's got a bevel at one end, and two
chromed knobs on the side at the other end. These hold a 2" eyepiece in place. Put it away in it's box. The flat plate that carries the tube you slide the 1.25" eyepiece into fits directly into the focuser.
raymo
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