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I didn't find it jerky at all, but the coarse focus adjustment was stiff.
I think the grub screws on the sides of the knobs are to hold them on!
You could try giving the bearing surfaces (including the barrel) a wipe down with isopropyl and water (50/50) to remove any dust or dirt.
There are tension adjusting screws on Crayford type focusers, but have a chat to the guys at Moonlight about this first. I have not made any adjustments
My hassle free money back offer still stands if you are not completely satisfied.
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