Fietsbob I took my dremel with a grinder bit to the cracks. I didn't go very deep at all, how thick to you think the crown is in this location? It's a pretty slender crown all around, is it probably solid metal between the steerer tube and where the fork blades are inserted? In photo 1 you can see the upper crack does go through the brazing and a little into the steerer I guess. I ground the crack in the upper part of photo 2 the deepest (but probably less than 1mm) you can see it doesn't appear to penetrate the brazing. It does look there is some separation between the brazing and the steerer tube on this side and maybe the other between the two radial cracks. I could ride it with a bolt through the fork crown and put some clear paint over it and monitor if cracks reappear or continue to develop I guess.