During the early 1970s I made a knife out of a broken power hack saw blade that my high school metal shop teacher provided. He said there were two types. Some only had the teeth edge hardened with electricity but the blade he gave he was hardened throughout. I only had to careful to not over heat it and after it was finished to never loan it. Steel that hard used by a fool as a pry bar will snap.
I made an aluminum hand guard and spacers out of scrap and drilled holes through a piece of purple heart wood to slip over the tang. I assembled it with epoxy and a cross bolt through the hack saw blade's mounting hole. It looks amateur but not to shabby for a 16 year old.
If I had it to do over I'd leave the teeth on the back dulled for scaling fish, make it shorter and not give it a clip point. It was more than enough work without making a pommel or butt cap.
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