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Some of us do care !! First have you read the recent post about Bundy tube that I started? Originally Bundy "seamed" (rolled) tube was soldered, later it was brazed. When the transition was made I don't know but willing to bet that it was prior to Model A time. Brazing takes red heat. If after braze they were "quenched" that could account for the hardness. However I doubt that the tubes were formed and flared prior to brazing... that would not work as a process step. So, I'm afraid that the tube is what it is, it may be harder than annealed but ... that's the way it is. As for the repop stuff, maybe just chalk it up to either and/or work hardening or Chineasium steel.
Joe B