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I know better than to anneal the head of the case.
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It sure had a different tone to me.
Any annealing work with that area has to be totally restrictive.
I can see why you suggested shot peening. sort of.
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If so is there a way to localize the hardening, say to just the head/rim area? Or is it a matter of annealing the area you want soft again?
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Annealing and hardening are two different things. So call me totally confused. It would help if you would describe the case and its issues or have a link.