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Originally Posted by AstroJunk
After experiment, I believe the roughness of feel is due to the gearing of the fine focusser - if you give the fine focus knob a helping hand when you use the course wheel, then the roughness goes away.
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You are right and I discovered this after swapping the barrels between my old and new crayfords. The barrel of the new one is quite ok in the casing of my old mono speed focuser.