First let me admit I have no idea what I am doing but figured I would give this a try. A Friend was boiling maple sap, so I asked if he would put three old files in the fire and let them in the fire until it went out. Afterwards I was able to cut, grind and drill a rough knife blank out. Next step was to try to harden the steel so I used some hardwood charcoal and a electric blower and I was able to get the blade red hot before quenching it in some oil. I then put the blade in my Wife's oven to soften it up a little. Epoxied and pinned some maple wood slabs on and sanded it to shape. TruOil finish. Not pretty but seems to hold a edge.