1. Removed existing rivets holding upper trailing edge of wing ribs, and 6W7-2. 2. Positioned 6ZU1-7 and inboard 6ZU1-6. Clamped in place. 3. Back drilled existing holes through 6ZU1-7 with #20 bit. 4. Clecoed 6ZU1-7 in place. 5. Back drilled 6ZU1-6 upper holes through aft spar with #20 bit. 6. Clecoed in place. 7. Removed aileron stop. 8. Positioned 6ZU1-8, and clamped in place. 9. Back drilled 6ZU1-8 through rear spar with #20 bit. 10. Clecoed 6ZU1-8 in place. 11. Clamped outboard 6ZU1-6 in place. 12. Back drilled spar spar holes through 6ZU1-6 with #20 bit. 13. Clecoed in place. 14. Marked location of aileron pushrod hole on 6ZU1-8.
