The worse the delamination of a cataract the easier it is to remove. One that small may detach while you're unmounting the CRT, if not use a pick to get out 8-12 chunks of the edge PVA wedge some halves of wood clothes pins in as wedges and sit it out face up in the hot summer sun and it should come unglued relatively fast and easy.
I think I had a equally rusty identical chassis out of a basement of a repair shop, I stripped it of parts but some remain...
If that chassis didn't have the rear bump out (which means plastic or metal back) I'd offer you a spare particle board back off of an admiral wide console I parted after flyback failure.
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