With enough skill and patience, any sort of metal object can basically be heated up and forged into a weapon. It always make for such a glorious process too. For example in this video, a wonderfully threaded steel cable rope gets pounded and pounded until it resembles something that can be shaped and shaped into a knife. There is so much work in the transformation but the end result is totally worth it.
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That’s not a cable knife. THIS is a Cable knife.