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How does the area look under a loupe? Can you see the spot if you look at it from a low angle? May help you to see if the defect is at the surface or just what that particular piece of horn just...

Are you wet sanding? Try using water while you sand. I shape with scrapers mostly but when I start sanding I go with 220 and water. I have a piece of plate glass I throw over the center divider in...