Dude what tinkering. There's like 2 minutes and 45 seconds of effort there, max.
Get a 5/8" diamond hole saw at a hardware store or home improvement store, and some 5/8" rubber grommets. Then you can drill bottles to your heart's content, and the holes will fit a standard 1/2" downstem, glass or metal.
Don't even fucking mess with plastic for a smoking device, ffs.
http://420armory.com/home/product/glass-hole-saw-bit-large/ This company offers the rubber grommet and downstem to fit the hole as well, but the hole saw itself is $10.
You can probably get a 5/8" hole saw for $5 or less at your local hardware store. https://www.amazon.com/uxcell-Diamond-Coated-Cutting-Silver/dp/B0087Y81MU/