Jon,
I've heard that you can use two polarized lenses on either side of the pane of glass. Rotate one of the lenses 90 degrees and you should see some type of pattern.
If I had a link to where I read this I would post it.
Sorry I can't be more help.
Mine wasnt drilled either i just bought kit from glassholes and drilled the back. Usually its just the bottom that is tempered but id call the manufacturere to be safe.
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