Wanted to provide a solution to my problem.  Since Oliver spreader parts are no longer available, I sought out a custom metal fabrication shop in Columbus OH.  They were able to get the sprockets off the shaft and clean then up quite a bit.  Second, they ordered a 1 1/8&quot; shaft, re-keyed the shaft and the sprockets and re-assembled everything.  The work to remove the sprockets, re-key, sand blast and repaint the old sprockets was $350.  All told, I have about $650 total invested in the spreader ($300 to purchase as an auction and now $350 to repair).  Have been using the spreader for 3 years with little or no problems.  Now, I know, not to use the spreader to store manure if the temps drop below freezing for a couple days.  Good luck to anyone with Oliver spreader issues.