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There is one thing you could try Jen. On the underside of the focuser you'll see 4 small screws that hold the pinion shaft in place. Tighten them equally about a turn or so, but not so tight it makes it hard to move the focus tube. Under the plate that they hold on is a spring that pushes on the pinion shaft and presses the inner tube against the inside top of the focuser housing. It has a strip of nylon inside, so wont go metal to metal. Should help to take up some of the movement.
Cheers
Bill
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