I'm getting better, but I'm still not a big fan of riveting on rounded surfaces. I managed to get through most of the rounded bottom portion of my 9A tailcone without incident. I did have one rivet that gave me fits though. I drilled it out and decided to upsize it and use an oops rivet (upsized the hole to #30 with a reamer). The result was another terrible rivet, but more troubling than that, a dimple that looked like it exploded. The bad rivet is in one of the flange tabs of a tailcone bulkhead. While the other rivets in the rounded portion aren't exactly runway model status, they're passable, and all of the other rivets in the bulkhead are fine. I'm trying to figure out what, if anything, I should do with that cracked dimple. Upsizing it again wouldn't really do much because of the extent of it all. Do I just leave it? Thoughts?