Get some valve grinding compound. Put some on the arbor of the crank and some in the flywheel. Then put the flywheel on the crank and start spining it back and fourth. It makes sure that the flywheel and crank have an exact fit. I like to do mine with the stator plate off. That way i can clean the crank arbor good, and not get any in the seal. It would tear it up if you did.
I got my valve grinding compound from napa. They have 2 different kinds. A water based, and a greased base. I would get the water based, it is easier to clean up. It also works good for getting striped scews and allend head bolts out. The screwdriver or allen wrench bites in to socket with that stuff. It feels like your going to twist the scew off before the head will strip.