I think I got it. I never even noticed that area before as it never presented a problem. Sure - I think you could soften those edges a little but I'd start with the sandpaper first and maybe some emery cloth? It really shouldn't take much. You probably want to protect the integrity of those curves so a stone with a straight edge might be a problem. But I think I see what you mean. I think mine is just softened with 15 years of wear