Hours: 5
I roughed up the fay surfaces of the tank stiffeners and then deburred and dimpled the mating holes. Then I worked on the z stiffeners- filed and polished edges, final drilled and countersank holes, cut to length, deburred and riveted nut plates on.
Edge finishing the z brackets. I hold the file perpendicular to the work and start from one end and work to the opposite end.
counter sinks for the nut plate rivets
back riveting the nut plates
finished z brackets with nut plates
I finished up by cutting the j stiffener to length and then match drilled it to the tank skin.
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