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Old 6th Jun 2021, 1:00 pm   #23
Nanozeugma
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Join Date: Nov 2017
Location: London, UK. North Manchester now and then :)
Posts: 476
Default 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.
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