Worked on the "whats left of the Dayton" 245a clone the other day. The crankshaft is buggered up at the keyway but I went ahead and picked up a flywheel off the bay anyway. I think it can be filed down enough to slip the flywheel on but I may need to tack some spots to help keep the keyway from wiggling around. I understand the tapered shaft means the keyway is only for alignment and the nut holds it in place. Pretty sure some rings are gonna be needed. Looking through exhaust the back of wall was shiny and intact.