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Try Steve's idea 1st. Try having the 4 screws a bit tighter, & note the focuser movement. If it's too tight, loosen the screws & try the movement again.
The 'glue' I'm referring to is the grease the manufacturer uses, it's really thick stuff. I got rid of all that gunk & replaced it with some high quality automotive grease. No doubt someone else could suggest something better.
IF the pinion is too tight against the rack, loosening those 4 screws will help to a point. But if this is the cause of the trouble, it's the housing where the pinion shaft runs on that's the problem. I had to put shims between the shaft & the housing to get some clearance between the R&P to fix mine, but not too far otherwise you end up with too much back-lash. I used very thin shim paper (actually made of brass) from an engineering W/shop.
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