Most tubes don't even need the wire or tube to be hot! I've done it with a cold wire on a 45f night. Having warm sun on the face can be beneficial to the ease of the process.
I use no. 18 steel guitar string. I had a video on photobucket, but photobucket don't work right anymore.
Once the safety glass has separated peeling/cleaning the glue off the 2 surfaces can be a much bigger undertaking than the easy string cutting process.
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