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Ric
You're describing an era of Celestron SCTs I'm not familair with.
With my 9.25 and with the current range of C8s all you have to do is remove the corrector retaining ring and then lift the corrector out from the front of the scope (gently) by holding the secondary housing.
On the current crop of Celestron's there are between 6 and 8 philips head screws which secure the corrector retaining ring.
The other important thing to do is make sure everything is returned exactly the same ie corrector position/orientation etc
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