When you look at that crank you can certainly appreciate the beauty of the NR forging and finishing. There's a lot of material on the NR. But I'm reluctant to grind too freely myself. Of course, you have to go deep enough to get rid of the crack. But if the crack is deep you can end up removing quite a bit of material and it looks kind of funny. Plus you remove the anodizing in that area. Once you put it on the bike though, it nearly disappears. I've only had to do it once, thankfully.