Okay gang
Dove back in and reassembled; the driver in question was still just a hair off. Getting it off the axle again after the Loctite was the hardest part. Re-set, re-"Loctited" and after about 4 1/2 hours of fussing, it's back together and running well...as of now. 
Question: the way this was made, once the threaded main crankpin is fully screwed into the driver, it sets it's own "angle" for the eccentric crank, which (in this case anyway), is slightly towards the cab, not the cylinders: at about 1 0' clock. If it's supposed to lean towards the front of the engine (at about 11 0'clock), why is it this way? Since the angle is the same on both sides, it works, but...?
Something else: the motor/ worm shafts are connected with that large brass collar which is held in place by those spring steel pins. This makes for a very rigid assembly. Seems to me a slightly flexible connection, such as a universal joint, would make for a more "forgiving" (and perhaps smoother running) coupling. Thoughts?
The good news is that, after taking this thing almost completely apart, I now have a sense of how it was designed, and should be able to trouble-shoot/repair it the next time it seizes up...which should be sometime in the next week or so! 
Mark in Oregon
