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I have the standard R&P focuser on my refractor. Rather than get a new one I stripped it & re-lined it with that teflon tape where the draw-tube runs so there was very little side-play. Cleaned out the 'glue' & replaced that. Also re-shimmed the pinion so there was no back-lash, but not so tight it was 'cogging'. I still get slight image shift, but it's not too bad..It's much better than what it was.
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