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If you cannot tighten your rings any more to give a FIRM but not crushingly tight grip then consider getting some more felt (Spotlight has felt sheets with adhesive on one side) and putting an extra layer in your rings to get the desired grip.
If you want to be able to rotate the tube in the rings then you should make a collar ring that locks in place that stops your OTA slipping back in your ring setup.
Cheers
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