Oldskoolbaby wrote:If i regrind it +0.050 to remove the said damage, then nitride the crank and finally regrind to +0.060 using shells from Minispares I'll have a very much usable crank once again?
Keep in mind that at about 10 thou you are through the hardest part of the case and at 20 thou you're into the core (i.e. the metal is indistinguishable from the deeper steel that was unaffected by the case hardening). So you'll be cutting the hardest part of the case off if you go to 60 thou after nitriding at 50.