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Hi Peter, I've read on CN that there are centering screws for the newer correctors rather than cork spacers. The 9.25 EdgeHD I have has 4 sunken hex head grub screws around the circumference of the corrector that appear to be for this purpose. I imagine one would back them off by equal amounts to remove the corrector, then firm them by equal amounts during reassembly.
The interior of my 9.25 Edge (few months old, purchased recently on IIS) is also quite grubby in comparison to my older C11. In normal daylight some marks can be seen on the corrector; with a torch more marks are visible and even the primary looks grubby in comparison to the older C11. Not-so-clean Celestron interiors seem to be a common complaint on CN in the last 2 or 3 years.
The optics of my 9.25 were very sharp on the one night I've had to use it so far, with good detail visible on Jupiter even at 120x.
A C6 I have between the ages of the other two scopes has a grubby corrector (oily marks or whatever) but a main mirror that is as clean as the C11.
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