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no big deal, get the set working deal with it last. I just did another a couple of days ago, soaked in small kiddie pool face down in a few inches of water after removing the tape around the edge. This makes the PVA pliable enough to dig out some for spaces to insert wedges into. after soaking place face up in a large padded garbage can, in the bright sun on a warm day. I use clothes pins for the wedges. tap them in around the edges, into the spaces that you can dig out. just snug, you can break the glass if you go too hard. walk away for 30min and check to see if still snug, if not tap in again, walk away, repeat this process. You will see stress lines in the pva under the bright sun, looks like shadows of fingers forming around the edge, they will form un evenly at 1st but will eventually form all around the edges and work towards the center. the process starts slowly but will speed up as the fingers get bigger until the lens just pops and you are done. move the CRT into a shady spot and let it cool off. You don't want rapid temp changes, even just using the sun to heat it up. After getting the pva peeled off the crt (it will come up easy if its an RCA tube, zenith is different and does not need the soaking as its already very soft and gooey, the defect on zenith is a green not white or moldy), clean both the crt face and lens. Foam tape can be applied around the edge of the lens, then put it back and hold it on with some clear packing tape, or use silicone caulk around the edge to keep it in place.
Warning, implosion is always a danger, the heat gun method is something I would stay away from, its just not needed.
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