> You could ofcource simply punch a hole with a carbon-rod after
> heating with a regular blowtorch...I used to do it like this when I
> needed a hole for some tubing

Yes, that was a thought I had, except I imagined a smooth steel
rod. I figured the cold metal would "fix" the circular hole shape, or
I guess any blunt shape. You could be right about the area around
the hole not being flat. If the glass was heated enough to make it
sag onto a surface, that would get it reasonably flat again

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