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Originally Posted by Starkler
If you are getting backlash in a crayford, it can only be the pinion shaft skidding on the main barrel flat, or the knob loose on the pinion.
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It's the pinion shaft being a bit loose in the bearings/bushings. If you grab both knobs and push one and pull the other, there is a bit of swivel in the shaft. If you press or pull on both knobs as you focus, the backlash disappears.
I must have got lucky with my ED80, I never had any problems (apart from getting used to adjusting the tension when changing EPs). It could handle 1.5-2kg worth of diagonal + barlow + eyepiece in it. Very smooth and even except at the very end of in-travel, which is rarely used anyway. (it is sold and paid for by the way, so I'm not making this up.
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