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I assume we're talking about basic mirror shift focusing?
One thing I learnt about my Meade Lx200's and that was to regularly say once a month run the focuser through full travel a couple of times....this effectively re-spreads the grease along the baffle and helps to stabilise the mirror.
If the mirror is always just moving around the same spot the grease is extruded from that area, and the mirror gap to the baffle slightly increases giving unwanted movement.
Just my 2c
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