I have an Oliver Superior Manure spreader and when the spreader was at its fullest, the rear apron shaft broke in  half.  I'm trying to get the two apron chain drive sprockets off the shaft, however, after being on there for 50 years, they are on pretty tight.  Anyone have any idea where I might be able to get those sprockets.  The sprockets have 7 teeth and are about 5&quot; in diameter.  The chain on the spreader is a 67H.

Thanks for any replies,

Bob Mayes