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Rack & Pinion Slop
On the SW880 10" I just bought, it came fitted with rack and pinion focuser and like most budget R&P's there is an annoying slop when adjusting, which shifts the EP up a tad. I had the same problem with a cheap EBay 3" dob.
Having been spoilt with the 2" Crayford on my home brew 8" with a 10-1 reduction gear, I found that the following really does fix the problem. Wrap a single thickness of clear contact around the outside of the focuser tube just leaving a small gap either side of the rack. -- No more slop - worked well on the small scope and lasted very well. A light smear of petroleum gel finishes the job.
This idea has probably been suggested B4 but thought it worth a mention.
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