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The only negative with O1 is that it is a hypereutectoid steel (carbon >0.8%), which means that to get the most out of it, you need to be able to soak it at a stable temperature of 800-820 deg C for...

For steel, have a look at Artisan Supplies. They have a NZ based store as well, so if you place an order on the Aust website, you will be dealing with the NZ based team.

For standard size knives,...

Assuming that you are only drilling the handle/tang for pins, and you are trying to keep the original saw blade heat treat, your cheapest and easiest solution is to spot "temper" where you are going...