I use a diamond hole saw and a drill press. I make a clay dam and fill with water to keep my bit cool. To make the hole larger, I use my drimmel too, while going slow and stopping frequently so it doesn't overheat and crack. (10/08/2008)
I took mine to the local glass company. They don't charge much and it is much easier. (10/08/2008)
By joyce from Canada
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