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 - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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