Back riveted stiffeners onto right aileron skins. Assembled aileron and match drilled A-905A&B ribs, spar and trailing edge. Marked leading edge holes on SS counter balance. Dissassembled aileron and drilled 1/8" holes in the SS counter balance using a drill press. Discovered that I preped wrong side of right aileron top skin. Removed stiffeners re-dimpled and re-installed stiffeners on opposite side. Results were satisfactory.
