Just look it up on google, there are many ways to go about doing it.

The main concern is keeping the glass cool and lubricated with water. Also make sure you hold the piece by hand because clamping it down could cause more pressure on the glass and possibly make it shatter.
Johnny McPotSmoker Reviewed by Johnny McPotSmoker on . Pyrex Flask Help i was wondering if any of the brilliant people in here have ever tried to put a hole in a Pyrex flask...Pyrex glass is heat sensitive so I dont think heating it up will help much, I got a glass bit, do you think it would be better to fill the flask with water when i drill? Or how do you suppose i put a stem in the flask to make my creation?:jointsmile: Rating: 5