Andrew has the right description. The mirror basically sits on the long baffle tube you see inside and you have to slide that out from the back after you have removed the locking clip at the front of it, which means removing the corrector plate to get to it. I have some photos from an old 8" SCT I took apart some years ago but I'm afraid you'll have to wait until tomorrow night before I post them (I've been out tonight and really need to hit the pillow!) But if you're interested I certainly try to get them up for you.
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