years ago when I was a machinist , I used that drawing to make a drilling template out of a neutral flywheel. I used hardened drill bushings for the drill holes, and dowel pins to line the drilling jig up to the blank flywheel. It looked pretty cool, but I never tried it so I don't know if it worked or not. It's in the bottom of one of my toolboxes, I think. I could probably post a pic if anyone is interested.
