Hello Bill,
Your comments about building early machine tools brought back a memory from trade school. One of our early projects was to make a four jaw independent chuck screw complete with square socket. The square socket was first drilled round to depth with four small corner holes and subsequently chiseled out square using a cape chisel. We were graded on this. As I recall the independent chuck screw turned out amazingly well. Through the years these hand skills were proven useful for other purposes as well. I sure enjoyed my time in the trade.
Dick
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http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
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OldToolmaker