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From what I can see from old 21" tubes there is a small opening (that was later plugged) on the tape surrounding the tube where the pva was injected into. (If it were just poured in there would be an issue with air bubbles I would think)
This is what I was told anyway, have never actually seen it done at the factory. The tube/lens will look fine without the pva but will not be as safe as it was intended to be without it.
Last edited by captainmoody; 04-04-2006 at 10:22 AM.
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