Removed remainder of protective plastic strips. Back-riveted all stiffeners to skin. Rivets nearest trailing edge are tough to reach, but they came out fine. Fluted E-603 and E-604 ribs. Aligned, clamped, drilled and clecoed ribs together. Marked for rivet placement underneath lip of counterweight. Drilled both counterweight mounting holes. (Reversed counterweight mounting holes from plans so that existing tooling hole can be used.) Fit and drilled reinforcement plates to spar. Clecoed spar to skin. Bent E-609 root rib flange to meet spar; clamped and drilled rib to spar. Called Vans (for the first time!) to clarify the number of rivets to attach root rib (manual says two, drawing shows three. Installed three.) Dimpled spar. Cut notches in tip rib to clear spar flanges. Positioned, clamped and drilled tip rib assembly to spar. Disassembled, deburred, filed and polished spar, reinforcement plates and ribs.
