illed 9/16 holes in left tank ribs for the fuel return line. deburred holes. Made a plate to cover the tooling hole on the outboard tank rib. Match drilled to the rib, deburred and dimpled. Disassembled the left tank. Taped up skin around the stiffeners. scuffed joints and cleaned with acetone. Back riveted stiffeners onto the left tank skin with proseal. Covered all shop heads with proseal.
