Thanks Rodney, I see now how a cam could work. I think finding one will be next to impossible though. Should not be too hard to make some, there is only 1 follower.
I've checked again for any JA marks anywhere and don't see any, they might be under this other serial number tag that is riveted on. I also checked under the motor mount where someone earlier on this thread found theirs. This is the only number I see anywhere on the machine, 52901:
I have my pics hosted on google, are they not showing up?