I ground a fair amount of metal out of mine with a Dremel tool, then polished it to look as close to original as possible. I continued the chamfer from the crank arm inward and checked as best I could with a jewelers loupe. Out of 4 Campy cranksets on my bikes and a couple off of them they all had cracks except the one on my super low mileage Paramount. I filed that one round.

Busting a crank really scares me, especially considering the collateral damage possibilities!