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With the TV chassis out it is quite quick and easy to remove the CRT on the CTC-4's...And that is almost certainly what you will have to do to get the safety glass off unless you want to risk cracking it with heat. That degraded rubber would make an awesome glue if it did not take a few decades to reach that state. I seriously doubt any amount of pushing/pulling/prying without heating the glue will get it loose. I did mine by removing the CRT, removing the mask, and then slicing the rubber with a pocket knife (I did not try to soften it with solvents prior to cutting). Once the glass is separated Goof Off will do a great job of dissolving the rubber off the glass, but I would use something gentler like rubbing alcohol (I forget what I actually used) to get it off the mask because strong solvents like Goof Off can mess up the paint on the mask.
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