tonight i got the stiffeners backriveted to both elevators, and 615 on the left side. these came out looking really good. when i get back i may look into getting a bigger back rivet plate, mine is about 4 inches wide and 8 inches long, i'm sure i can find a larger peice of steel at work and clean it up for this purpose. now i have to be careful to stay on the plate while backriveting.
