Help - Oliver 22A Sickle mower

I am rebuilding an Oliver 22A sickle mower. The mower belonged to my father-in-law and we bought it on his sale. I purchased another sickle mower for parts and found out it was an 82 not a 22. I thought about just making a Frankenstein with the good parts from the two but changed my mind and will restore it as close to original as I can. Now my problem, I need to remove the bottom shaft with the counter weight that drives the sickle. On the 82, the sprocket is held in place by a nut. On the 22 the shaft is threaded into the sprocket. I tried holding the input (PTO) shaft and rotating/jerking the counter weight (counter clockwise) but that didn’t work. I ran out of time and thought I would ask if anyone has had one of these apart before.
Thanks for any suggestions.
John Schoenauer
 
OK another question that might be easier. What years were the 22A made and when did Oliver switch to the 22B? When did they bring out the 82?
Thanks
John Schoenauer
 

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