i used a diamond core drill bit on a drill press, i have a metal shop so tools are handy

. i did use water to keep teh bit cool. the trick is to mix a squirt of dish soap to the water for some lubrication and put it all in a spray bottle. then just keep the bit wet and cool. Then jsut drill real slow it took about 2 minutes of soft and constant pressure for me to finally get through... i had to experiment on a couple of beer bottles before i got the hang of it. but im real happy with it, but it could be better.....
im interested in this GonG techniques......I once tried using map gas and melted a hole in a beer bottle the put a downstem in it, let the liquid glass make a seal. and let it cool, but the cooling was too rapid (even at room temp) and the bottle broke by itself, the bottle was sitting there all fine then i just hear cracking and i look over and the thing shatters and collapses on itself, but the downstem was alright. let me know.
Blazon