Countersunk T-407 reinforcement ring for platenuts. Manufactured anti-hang-up guide for R tank and a new one for the L tank. Drilled R tank fuel cap flange. Countersunk holes and deburred. Match drilled R tank drain flange. Deburred inner skin fuel cap and drain flange. Deburred all outer holes of R tank skin. Deburred L and R wing W-423 joiner plate holes.
