Recently got a 10" Meade LX200 GPS SMT and had to remove the corrector plate to clean the dust off the back. Unfortunately the glass was stuck to the thick gray paper gasket. Of course you don't want to use any metal to pry it out as that almost certainly will chip the glass.
To get it unstuck I used a shaved popsicle stick through the gap in the cell casting that allowed the stick to go past the shelf cast into the cell that the corrector plate and gasket rests against. I then tapped the stick into the gap and as it got thicker and thicker it eventually pressed the corrector plate sideways enough that it broke loose from the gasket. I thought the popcicle stick was ideal as it was just the right thickness at it's thickest and the wood is actually quite soft so it would be gentle on the glass.
This technique may apply to other brands and models of SCT telescopes, I don't know if others have the gap necessary.
No guarantee this will always work or that it's foolproof, it might still be possible to break the glass no matter how gentle one might be. As the back of the glass was pretty dusty I figured I had little to lose.
Edited by Tom Duncan, 16 October 2019 - 08:25 PM.