Greetings,
Mr. r. Although your suggestion IS an option I cringe at the thought of it if the glass is tempered. It only takes a bit of grit between the glass and the, I assume, rubber bedding/gasket to create a "hard" spot which could initiate glass fracture (explosion) whilst tapping. It doesn't take much sometimes even on the microscopic level. If the glass is laminated, MUCH less possibility of damage.
Just read your post Mr. byu. Good comment.
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RTF
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