Circular Hole in a Bottle
During the 70's hobbyists were cutting bottles
to make glasses, vases, bowls, etc...
Tie heavy twine around the cut line.
Soak in lighter fluid, light, let burn,
then plunge into a bucket of cold water.
The bottle should part right at the string line.
Then use a Dremel tool to smooth the cut.
You've got lots of bottles...experiment !
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