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@Richard_Cheese
Well without getting too technically - if you measure between two peaks on a thread and it's just under a mil then you could hazard a guess at it being 26TPi, or if it's just over a mil, 24TPI - the 1 inch bit wasn't a reference to diameter more just a confusing method of working out how TPI you're dealing with on a fork thread. Works for me, but I seem to like doing things the hard way for some reason...