Re: Enlarging an existing hole in a steel chassis.
Just to put this one to bed, and thanking all contributors for their thoughts and experiences.... I did eventually purchase a cone drill set - but decided against using it in case it "grabbed" at the metal and distorted the hole.
In the end, I placed a card template over each hole to define the new diameter required and reamed the hole out gradually with an abrasive drum on my Dremel. Worked quite satisfactorily.
Thread may be closed at Mod discretion.
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Thermionic Emission, warms the cockles of your tubes.
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