As always, Jon, Diane, and everyone that posts here: thank you for the kind words of encouragement! I've said it before, but I'll say it again: I'm not learning all this stuff to keep it to myself! If I can pass on something I've learned from another homebrewer, then this thread is a success.
Steve, I hand ground down the 7mm keyway until I could get the 6mm Lovejoy on the shaft. I bought a hand grinding stick-thing at Lowes and just went at it. It's not pretty or easy, but no one will notice except me.
Basically, you have this setup: motor -> 6mm keyway -> spider -> (whatever Lovejoy fits the Schmidling shaft) -> schmidling mill.
Depending on the mill's shaft height, you'll have to make a spacer from where you mount it to raise up the mill shaft to approximately the height of the motor shaft. It doesn't have to be perfect
, just pretty close - that's the joy of Lovejoys. The wiring diagram you'll likely need to use for the Power Grinder is #2 in the hand drawn packet. #1 makes my MM3 run backwards. IDK which way the shaft is facing on the Schmidling, but I'm sure you can figure it out from the pictures I've posted and by looking at your mill.