J-Mech:
I know, guess I'm beating a dead horse.
Guessing the two forward horizontal pins go in the same slots the mower frame/mule drive went into. Rear slots go where the mower frame mounted.
Blade and/or blade pivot don't show a lever to angle the blade. What keeps the blade pivot from falling (not shown).
Guess I'll have to jury rig somethin' or other. I do have *.pdf files; blade, frame, pivot. I'm feeling they aren't complete.
