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Ok. 4” = 101.6mm. Is the 4” lens also in a 4” tube?
Sky-Watcher call them 102mm rings.
Saxon call them 102mm rings with 101mm I.D.
Orion call them 100mm I.D. rings.
They look like they all come out of the same factory but perhaps not. Could also be quality control issue.
Do you not have enough length in the captive screws to be able to lock the rings around the tube?
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