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Paul, I tried two Crayfords at Bintel one in a box one on a scope. The one in the box had "pinion" shaft backlash but an evenly machined "rack" surface. The one on the 10" Dob had no backlash, but uneven tension: it would get stiffer the further out it got. And my new one has backlash and a sloppy barrel without the tension way up.
So QC does not seem to be best with these cheap Crayfords. But that's to be expected for a $99 focuser, I guess.
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