Drilled, deburred, primed Rt Flap mntg brackets, except center brkt. Riveted Fwd and Aft brkts, temp mounted flap, center brkt lined up perfect in 2 holes in ribs, removed flap Drilled/deburred/riveted center brkt. Mounted flap Instaleed Rt Alieron to bell crank pushrod, enlarged hole to spar.