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Originally Posted by Bruce of MN

Rather than taps to chase the threads, these should remove less metal and preserve to factory fit.

http://www.langtools.com/sku-2581-26...p-and-die-set/

The '"farmers' fix" thread chasers are nothing more than an original Model A head stud that has a long lateral grooved slot milled into the threads with a Dremel cut off wheel. Virtually making an original Model A bolt look like a tap. Some cheap HF taps have been known to remove too much material or at the wrong places / angles causing a loose bolt fit.