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Make sure you are using drill bits ment for glass. I use ones made by black and decker that say for glass or tile on them. also make sure that the peice you are cutting is always wet. It is best to do it underwater belive it of not. The water issue is most likely your problem. If i where you i would turn that thing into a staright tube Bong if you could drill in at a slight down angle that would help. Then you could just put a rubber fitting in there and a downstem and you would be good to go.
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