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Hi Jeff,
Hmm yeah there definitely is a bit of movement when I don't have the 3 thumb screws tightened up on the moonlite. When I do it up, it does *appear* to be quite snug, but maybe because the Howie Glatter is so damn heavy, it could be still having some slight tilt. I'm about to head out to the observatory again and try moving the tube right down so that the first ring is snug against the focuser for a test. If there's no more movement there I'll probably end up ordering some more rings. If there is, I'll try shimming the collimator.
Cheers, Mike
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