Well, I played around with the Dremel last night. I used a carbide grinding bit. I think I got through the crack, though it needs more cleaning and polishing than I had time for.
I did use the jewelers loupe to look at the cracks, and a that magnification they look like the Grand Canyon. So far, 4 out of my 5 Campy crank sets have the cracks to varying degrees.
Crap.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group