Countersunk the top flange of the trim tab spar for the dimples in the skin. Dimpled the trim tab spar bottom flange. Dimpled the trim tab skin amd control horns. Riveted the control horns to the skin. Clecoed the trim tab spar to the bottom skin and riveted. Riveted the top skin and hinge to the trim tab spar. Countersunk the ends and pulled the CS4-4 rivets.
