Riveted VS-1207 Upper and VS-1208 Lower Main Ribs to VS-1202 Front Spar. Joined VS-1203 Rear Spar with VS-1207, VS-208, VS-1205 Tip Rib and VS-1206 Mid Rib to complete V - Stab Skeleton Assembly. Drilled out 2 improperly set rivets (AN426AD3-3) and replaced. Removed material from Forward Skin (VS-1204).