Drilled and trimmed butt rib brackets. Installed left side butt rib and fitted with wing attached. I used clamps to hold the rib in place to align brackets with washers providing the 1/16 " gap between the two ribs. Once everything was lined up I drilled the attachemnt holes from the attach T shaped brackets to the butt ribs. Moved the wing out of the way and clecoed the butt rib in place so I could align, trim, and drill the butt rib attachment tabs which are welded to the fuselage. Then I removed the rib again and permanently attached the T shaped brackets and the aluminum cap strip to the butt rib. I also started working on the jury strut brackets.