A tool I built so as to drill accurately the end of several styled JD "Ds". Tapped and threaded to 5/8 11 TPI:
Shims are placed between the end of the Crank, and the RETAINER WASHER and or between the FACE of the RETAINER WASHER and the FACE of the FLY WHEEL:
Flywheel cannot move linearly ...
Bob...Retire Power Engineer....Having fun.:)