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Originally Posted by
Geezer
And, it also may be annealed. Heat to red and quench in cold water. It is a white brass, non-ferrous material. Because if that, it work hardens quickly and may need some extra annealing steps while working it to shape with a hammer and filing to flats. It does fill a file and scratch easily, so chalk coat your file before use. Old files work best for the softer materials.
YMMV
~Richard