I don't usually work in feet and inches (except when dealing with PCBs)
but I have to say that converting something like 5/16 inches into mm is an
interesting exercise, especially when the spacing is to be repeated tens
of times in a row (the conversion error adds up: the exact value is 7.9375
mm which includes a 500 nm (nanometer) component). Oh, and good luck
finding a 5/16 drill bit let alone a screw tap in a metric country on
short notice. Or a screw. I have some surplus RCA thyristors that have no
nuts and I can't use them ...

I always wondered where the old English got these fractions from. 5 I
understand but 16 ? 1 1/3 dozen ? Aargh.

Peter

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