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Do you mean it slips out of the rings and potentially onto the ground or when stopped the focuser banging into the rings?
If so just place another ring with a smooth edge around the scope and don't attach it to anything else. I think they are referred to as Wilcox rings after Eric Wilcox who has popularised them. A very simple idea and very effective. The contact with the main rings also acts as a useful brake to keep the rotation smooth.
Cheers,
Cam
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