HI chuckFranko, I have a spare 1/2 x 13 LH tap if you need one. I bought a batch(new old stock) on E-Bay a while back. I've made a couple adapters for treadmill motors with them. All the DC PM treadmill motors I've collected have that thread on them. I made the pulley for the TM motor that runs my mill from the small end of it's flywheel.
Chuck
I would like to purchase one of your taps if you have one available. I would like to tap a pully of the treadmill motor shaft. Thx. Please pm. Thx. Gary