Tonight I deburred the rest of the F-716L/R ribs. I drilled the plate nut screw holes to #19 and the rivet holes to #40. I then dimpled the rib flange plate nut holes and the plate nuts themselves. After fluting and seaming the flanges, I riveted the plate nuts to the ribs with the main squeeze. I cleaned and primed the underside of the rib flanges before riveting them. These parts turned out nice.
