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I mean 3 times of tempering in different temperatures, and one final quenching on the edge. I was told by a Japanese metal engineer long time ago.

leave it cold enough, use angle grander trim it to whatever you like it, and then four times heat treatment....I was told. hope this could help

Are you running a machining shop? Do`t know in NZ, Time ago.........there are many machining shops in my city, they did everything for business or for personal use like ice fishing tools, farm tools,...

If you only focus on the function of knife, the sharpness for example, not the looking, then most of machining shop can make good blade but you have to know them well I think. Truck leaf spring is...