If yours used an extra switch and would engage below about 27mph (1st gear) the wiring had been modified. That probably also accounts for the free wheeling. The switch would have made the ground connection and bypassed the governor.
I have a new motor for my mill coming. When it is up and running I'm going to try making one of the Borg Warner ODs into a stand alone and hook it up on the 1919 Essex speedster project. I haven't figured out the reverse kick-out yet. The ODs don't like being turned backwards.
