GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
need to chase the threads on a 1965 3hp 3502 lightwin crankshaft. Need original size/thread pitch and if this don't work what size smaller die to use, thanks.
7/16-20. Next size down would be 3/8-24 (fine) or 3/8-16 (course). OR, probably a metric somewhere in-between, which I'm not smart enough to answer without getting out the charts.
