Also, being able to tap a hole slightly oversize, to accomodate SAE
fasteners in place of sloppy metric threads is handy.
I don't understand how tapped threads turn out grossly oversized on China
equipment, but it's fairly common, IME.

--
WB
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wrote in message
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I have, on occasion, re-tapped an existing hole for 1/8 pipe from 28
tpi to 27 tpi - use lots of dope!