After being disassembled, all the holes were deburred, then dimpled, and then the mating surfaces were primed. All was clecoed back together, and then riveted.
The upper rivets are left out to make room for the main longerons to be inserted between the skins and the bulkheads. Also the forwardmost bulkhead is not riveted at this time since it will be assembled with the center section.
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