Tonight I riveted the E-902 spar to the top skin of the elevator. About 20% of the rivets could be squeezed; the rest were accessed by clamping the bottom skin to the table and then spreading the top skin so that it was possible to get a bucking bar in there to buck the rivets, two at a time.
Backriveting doesn't work here, because the skin flexes and it is not possible to keep the rivets flush against the steel backplate.
I'm learning to cut objectives down into smaller sessions. Get better results when I slow WAY down!
Total time: 1.5 hours