Removed control horn and deburred and re-primed holes in horn and spar. Riveted horn to spar. Roughed powder coating on control horn for future painting. Had to drill out and replace the first two rivets out of 12 due to not using the right size riveting head. (Yeah, that'll do it!) Clecoed skeleton into skin. Aligned, drilled and clecoed tip and root ribs to skin. Fitted E-613 counterbalance skin. Clamped and drilled in place.