Jason and I attached the nut plates to the E-615PP with the squeezer. Then we riveted all the stiffeners in the right elevator skin using the C-frame for back riveting. We also riveted the stiffeners in the left elevator and riveted the E-615PP to the skin using the C-frame. Quite a few rivets for both sides of both elevators, but all were driven well using the C-frame technique.