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Have you run the focuser fully in and out, it is important to distribute the grease, try a star test before going to the next step, a lot of SCT mirror flop is corrected by this simple fix. The collar I am talking about, look into the front of the tube, where baffle and the mirror are joined there is a black ring with 2 fine holes, underneath the ring is a cork gasket, if the tube has been jossled around that ring can loosen. Check the other things first because this requires you to take the corrector off, no big deal, but you will need to mark the orientation of the corrector and the location of the shims if you do this.
JohnG
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