Riveted F-916 seat ribs to F-904B blkhd. Was able to squeeze top and bottom rivets, but I screwed up the top rivet if the #2 seat rib. Distorted the hole severely in drilling out the rivet; had to go up to an AN3 bolt. Satisfactorily completed the other rivets with gun and bucking bar; torqued and sealed all AN3 bolts.
When I dimpled the F-904A flanges, I got the direction wrong on the outboard 5 holes, each side. Flattened and dimpled them back in the correct direction--you can do this ONCE....
