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Yes, Rob it made me nervous also! I kept heat from a 150w floodlamp aimed at the middle of the tube as I went around with the heat gun trying not to localize heat. Even with gloves and protective goggles on I was still worried about what might happen.
I dug out a little area on both sides with my plexiglass, It took only a minute or so with the pva heated up, I then noticed air pockets spreading across the glass rapidly then that was it! I just lifted off the outer glass! The pva pretty much came off in a sheet.
The other method mentioned using the nichrome"hot" wire sounds faster, But with my luck would end in disaster.
I was told originally that when these tubes were rebuilt they heated them in an oven with their vacuum relieved to remove the implosion shield.
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