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Actually annealing and tempering are two different things. You can't anneal tool steel in a kitchen oven. Temper yes, but not anneal. For annealing you need basically the same heating capability that...

You are thinking of heat treating, I think. Heat treating hardens the steel and it happens with most steels when you heat it til a magnet won't stick to it, then quench it in oil or water depending...

probably could use the sling.