DELETE RADIUS AT TRANSITION FROM WRENCH PADS TO BASE FLANGE, REVISE DEPICTION OF BOTTOM OF LIGHTENING HOLE, UPDATE REFERENCES, CORRECT TYPO IN APPROX MASS FOR AS3611-6-60. CORRECT ERRORS IN APPROXIMATE MASS FOR AS3611-12-20 THROUGH AS3611-12-96, ADD NEW NOTE FOR EXISTING INVENTORY DISPOSITION, UPDATE FPI REFERENCE, FIGURE 1 RE-DRAWN, GENERAL EDITORIAL UPDATE.