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On the upside,the mum is in a place that can be buffed out to a rough surface(late war finish)and touch blued without a lot of problems.So yea,to the guy that asked if he should regrind the mum,in this case,go for it. The metallurgy specs note could be off a lot of things.Sounds like aircraft skin related info... the seller may be that "mum-humper" Doss has observed before,left the show circuit for the net?
