Dave Ross worked with Gary. Riveted both bottom skins to wing. Began w/outboard skin by riveting outboard from rib 9. Started riveting inboard skin from rib 5 rear spar area, working out & down. Used pop-riveter to rivet skin to ribs 2-4 & along rear spar. Used hand squeezer to rivet along rib 1 & around access panel. Reattached NavAid servo. Control rod was attached to servo by only finger-tightening nuts.