Just a nut

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Was the hardened crank a ***** to tap out?
No, the center was not hard. Fairly easy to drill and tap. I made a two-step guide. Large ID to just fit the shaft and smaller ID inside to fit on the taper. That kept it centered. Drill bit hole was long enough to keep the bit aligned. I was able to drill in about an inch as I recall. It was a few years ago.
 

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