Cycle thread taps & dies

[NortonDommi]

Olderdan,
Did you make RH and LH? My oldest motorcycle was a 1926? Royal Enfield that was the first motorcycle to have foot gear-change, it still had the hand-change as well. Hand oil pump, spark advance/retard and externally adjustable main jet on a thing called a carburetor. I really, really regret selling it now to buy a new 1980 Yamaha TT500.
A lot of motorcycles from around the world were still using RH and LH threads into the early 1960's, not so dumb either as the total harmonics were considered and everything tightened itself up and as long as you knew never a problem.
The above 'bike I bought age 15 and rebuilt including a Gold plated carb as Dad had a polishing business,(it was Brass).
I wonder how a millennium would cope?