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On the LX200R/ACF tubes you can remove the original focuser knob (grubscrews in the end) and there is a nut underneath. If you do this right up then back it off about 1/8th of a turn it will remove a lot of slop from the mechanism only really leaving free play between the baffle tube and mirror to worry about but this is minimal. Only problem is that the focusing action can become very heavy and you need to find a balance between slop and focusing action which means mucking around with the adjustment for a bit. I did this when I first got my Meade with good results but have now switched to a feathertouch microfocuser and a moonlight stepper crayford. For visual the FT is ideal, for AP the moonlight takes over.
Mark
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