Trim Tab: I marked, drilled, deburred, and riveted the trim tab end tabs. Then I positioned, clecoed, and drilled the hinge to the top flange. Disassembled trim tab, deburred all holes and riveted trim tab horns to the skin. Some of the flush rivets were difficult to get at since I had previously bent the trim tab to final angle. It was especially difficult to rivet the ones near the trailing edge but with a bit of patience and thought, I managed to complete this with very good results.