2 bearing crank in 3 bearing case

[Bob Culver]

As with seat inserts sad tales of failed sprayed crank build ups abound. The usual response is "the process is now improved....." 
And maybe not so much now when large radii are normal, but reconditoners were notorious for tightening the radii. If the crank is nitrided it is a pity to grind the radii, although I suppose with the larger crank the fatigue protection is less vital..