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yea I was not really thinking of roundies when thinking about the banding, I have several caterat rectangle one that have no safty glass in front of them.
so perhaps the factory had a fixture that held them apart and then the pva was just injected in. That does not sound to impossilbe to duplecate.
I can see holding it sideways with the injection port on the bottom and then leaving the top un sealed with tap, fill'r up and then tape off the top side.
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