You're saying to use a sliver of a penny instead of filing the woodruff key, the penny being thinner than the key ? Makes sense assuming I don't have an issue with the penny falling out as I replace the flywheel. I guess if its at the 12 o'clock position it should stay still. The use of a stop watch though has me wondering what you are referencing. Dummy! You're referring to timed cuts, correct?
Bob
Bob, you don't want to file the part that sticks down in the crank, just the part that sticks out. That way it will still stick in the crank like it's supposed to and you'll still get your advance. Just mark it while it's in the shaft with a marker pen and pull it out and file it off where the mark was. Much better than a penny loose in there I would think.