Here's an idea..maybe http://www.freepatentsonline.com/4582540.html
Another heat source which might work better than a solder iron is a heat gun
- one with temperature control. If you warm the glass first (maybe keep a
fan heater on it?) then you won't have the hot/cold shock factor which is
likely to make the glass crack. Steinel make very good electronic variable
temp. controlled guns.
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