Step 10: Riveted the Nutplates to the Bulkhead Assy. Step 11: Clecoed the Hinge Brackets and Flange Bearings together. Step 12: Final-drilled the #30 holes in the Hinge Brackets and Bearings. Step 13: Riveted the Hinge Brackets, Bearings and Fuse. Assy. together. Step 14: Inserted SB437-4 Bushing into the Bulkhead Assy. after drilling hole out to 7/16" with a Unibit.