Riveted the Bearing Bracket Assemblies to the Seat Ribs and F-1206F Bearing Bracket Brace. Assembled the Pulley Bracket Assembly and then riveted it per plans. Riveted the F-1218 Flaperon Mixer Brackets to the F-1220A Fwd and F-120B Aft Intercostals. Riveted nutplates to the F1219A Flaperon Mixer Arms. Bolted the parts together to complete the Flaperon Mixer Arm Assembly except for minor adjustments and to safety the cotter pin.