Riveted FL-706A and FL-706B to the inboard end of the spar. FL-706A riveted with AN rivets only, to later attach the end rib and spar. Riveted FL-706B and platenut to the inboard FL-704 rib. Riveted the rib to top and bottom skin. Riveted the spar to the ribs with blind rivets where access was difficult. CCC-32 Cherry rivets used instead of 3/32" flush rivets in these places.
