[ ... ]
The older one has a square notch in the head just below the handle and on a side which has a lever with a spring loaded pin. Set it pointing in one direction, it feeds that direction. Set it pointing in the other direction, it turns in that direction. Set it pointing straight out, and it is locked against ratcheting in either direction.
I really prefer that to the sliding direction changer on the other two tap wrenches.
Of course -- then there is the two bar tap wrench which I made to handle up to the Morse Taper #5 reamer (barely). Started with 3/4" square steel stock for that one. Copied one of the much smaller cheap tap wrenches which I have.
Enjoy, DoN.