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what do you guys think?
Heat treatment is another option to achieve the same thing but requires equipment not normally found in a home workshop. i.e. something to bring it to 600C and hold it there for a while to ensure all of it is at that temperature and most importantly allow it to cool down evenly. Usually done by allowing it to cool inside the furnace as the furnace cools down.
Sticking it in the centre of a bonfire can work, and provides a long cooling time. Jo