Clecoed flap brace & hinge to bottom skin. Because the 3 outboard holes in flap brace/skin are too close to the edge, drilled 4 holes in-between the 3 holes so that there is proper edge distance. Drilled #30 holes in flap brace to spar. Took inboard top skin off. Deburred all holes. Dimpled holes in skin w/pneumatic squeezer. Countersunk holes in flap brace.