Installed the remaining elevator ribs. Installed the rear spars and began installing the front spars. I used the specially made bucking bar I bought from Cleveland Tool to buck the rear spar rivets. I worked like a charm. It's unfortunate that I'll no longer have a need for the bar.
Elevator ribs assembled with four pulled rivets
Riveted rear spar. The specially make Cleveland bucking bar worked great for the rear spar rivets.