I searched the forum and found a couple other people with the same problem. One guy welded the gear to the counter balancer weight. That seemed a rather incorrect way to solve the issue. I think the shaft has some wear but a new one is unavailable. If cutting the keyway won't work I'll have to try to find one on ebay or dig through my parts and try to find a better one. There could also be an underlying issue I haven't yet identified.
I would love to hear from Carl or Jerry but I'm sure they are both pretty busy this time of year.