If you can get a small torch head into the screw, heat it up as much as you can & let it cool, but not get the crankshaft hot. Goal is to draw the hardness from the set screw to make it more drillable.
Also, don't run your drill too fast & keep it well lubed.
Solid carbide drills are avaialable, but are pricey. Feed VERY carefully, as they can snap easily if they catch an edge.
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Today's Featured Article - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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