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I then heated the faces, one at a time, to red hot using an oxyacetylene torch,
then simply quenched it in water. That's not the best method for 4140, but
being a body hammer, it's more for light bumping rather
than heavy pounding like you'd see with a sledge.

The faces ended up, I'm guessing somewhere around Rockwell 50C.
A sharp file could cut it, but just barely.





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