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Not entriely unheard of, but some small rebuilder's didn't even re-install the bonded glass and not wanting to deal with PVA and that whole messy process. I have one such tube that's been installed for many years and I'm not concerned about it "imploding". I do prefer the more original look though, but it does make a sharp picture.
And I've seen (much) later rebuilds that had siliconed the faceplate in place, much as we do today.
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