We haven't been able to find any. However, someone who paints them and puts white string lights in them, told me to put tape on the sidewall first to catch the glass pieces and help in drilling. Then, SLOWLY with a bit for ceramic, drill out the hole. Even with care, expect them to break as there is a gas inside from manufacturing. Same advise came from a building Big Box store. It can be done though (12/01/2006)
Use a glass bit, 1/2 in size, it will cost about $13.00.It is best if used in a drill press.
Build a dam of plumbers putty about 2" in diameter. Fill with water and keep water level up.
This cools the glass and the bit.Drill at steady but not too fast pace. Patience! Good Luck. (12/04/2006)
By mike j
I used 1/2 inch drill but I think a bigger one would be better because the 1st light has the extra part sticking out and wouldn't go through the hole.
I think 5/8 would be best or 3/4 (10/01/2007)
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