Prepped and riveted the F-830B(PP) stiffener to F-829 Front Seat Floor. Fabricated, prepped and riveted the F-832E Seat Back Hinge to the floor skin. I recommend that anytime you're riveting hinge material, you lower the pressure on your rivet gun to the minimum practical--say 30 PSI or so--and use a 2X gun instead of a 3X or larger gun. I seem to re-learn this lesson every time I deal with hinges. The hinges are very soft aluminum, and it's easy to over-drive the rivets and cause ripples in the hinge. I over-drove mine, and the seat-back hinge came out slightly wavy -- not enough to cause problems with inserting the hinge pin, but just enough to annoy me.