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The flop/slop is caused but the clearance between the baffle tube and the main mirror sled.
Nothing really to do with the focuser.
You need to run the focuser on the SCT 30 turns either way a couple of times to re-spread the grease between the baffle and the sled to reduce the slop.
Having said that the focuser design on the Celestron is pretty good fpr locating the main mirror.
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