Join the club, Gregg. I don't think there's a great deal of knowledge floating around about an A900. That's why it's cool to get to work on one. You have to learn to fly it by the "seat of your pants." If you check it out on Acres, he doesn't include very much info on it and even what he has is not complete. For example, he lists the chain pitch as 9/16". This one is 1/2".
Model Profile: A900
That is quite the ornery looking contraption Steve. I was wondering the same thing Bob mentioned. Whether it can be switched around to a right hand configuration? I'm guessing not. That thing makes me feel older than I am. I was born in 1953 also.
I wonder if MrBowsaw out there in California has one like that? He probably would be a good source of knowledge with that, if not parts. That would be a fun GTG saw..LOL
Gregg,