Dimple countersunk the #40 nut plate attachment rivet holes. Dimple countersunk all of the #40 holes in the F-830-1 and F-831-1 seat floors. Dimple countersunk all of the #40 holes in the F-830B-1, C-1, D-1 E-1 and F-1 floor stiffeners primed all of the floor parts back riveted the F-830B-1, D-1, E-1 & F-1 floor stiffeners to the F-830-1 left seat floor. Back riveted the F-830D-1, E-1 and F-1 floor stiffeners to the F-831-1 Right seat floor Riveted the F-833D-1 rear seatback hinge and the associated F-830B-1 floor stiffener to the F-830-1 left seat floor. Dimple countersunk the attachment rivet holes in the four nut plates that mount on the F-830-1 and F-831-1 seat floors.
