Thanks for the info re tile drills. One suggestion I saw on the
web was that you use a drill press with the spring removed
and let the weight do the work. Build a dam to hold turps as
lubricant then watch and wait

The glass supplier I went to (which does stained glass and
fittings for local artisans and hobbyists - "The Raffia") did
mention that tile bits aren't suitable, but they probably have
higher ideals and standards when it comes to their chosen
profession, whereas  I'd make do with a slightly naff job for
home and friends. I even suggested using a masonry cutter
to them but the outbreak of air sucked through teeth pretty
much brought that particular thread to a speedy conclusion

Yours and Spehro's replies think maybe I shouldn't necessarily
take the experts' word as being the final opinion. The way they
do it commercially is likely to be far more refined and efficient
than a way it could be done amateurly

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