Hmmm. I suppose that a crank like that one, with the scallops to try to increase counterweighting, is going to be more vulnerable to disk failure. Just like a blown Cox, no?
I just worked on a Fox this morning. I stoned the mismatched machine marks on the intake window. It was too much work to get them all, especially in the corners---where one of these days it's going to break! That one has a full disk, though, so maybe I will be spared your particular sorrow...
Sorry to see your busted piece. Was that what you had in the Kania yesterday?
McSlow