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Not sure what you mean, is the movement of the focus tube proper stiff, or loose/very loose?
Sometimes if stiff, a total dismantle, and re-lube can work. I agree with Davo though, maybe time to try a Crayford, although there is nothing really wrong with the R&P design. Mostly it is the glue they use as lubricant. Get a local knowledgeable astro type to look at it.
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