Inflation Rockets By 13% In A Sigle...
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I found one in a charity shop. Would they be uncommon?
I've never heard a left-hand thread called AF but before we went metric we had AF and Whitworth nut/bolt sizes where Whitworth was named after the engineer and AF was Across Flats. Left-hand threads are frequently used on such things as car hubs on one side of a car where the rotating wheel can loosen a centre nut as used some wire-wheeled sports and racing cars.