I found a "tach drive assembly" on Steiner's web site for a MF 50.  It looks like the one in my parts book for the 333.  Not sure if it's the same thing.  I don't know exactly how these assemblies actually mate to the generator.  The end of the armature on my generator has a slot in it.  Anybody know how these things fit together, and whether or not the assembly on Steiner's site will work on my tractor?

Thanks, Glenn