so i have been drilling glass quite a while now and i found a nice bottle i want to make into a steamroller, but a steamroller with an ash catcher. my problem is that the metal piece i bought is in one side bigger then my bit. expanding a hole with a smaller bit really causes it to almost break. any guys have some advice while trying to expand a hole bigger then the bit itself? ill be thankful for any advice. what i want to make should look similar to this (not that fancy though):
what i use is a dimaond dremel tip. its shaped like a cone and i can work it in circles making as large of a hole as i want. I have never used an actual drill bit.
http://cnthreewinin.en.made-in-chin...AWM/China-Glass-Tile-Drill-Bit-TWD00023-.html im using one of these