Here is the rear HS spar complete including the hinge brackets, and bearing bolts properly torque. Keeping the rivet heads aft in this  installationallows for easy repair if a rivet needs to be removed in the future.
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  Check out the fwd side hinge bearing bolt and nut installation. By the way those are the AN960 washers not to be confused with the thin 960L.
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  Completed the fwd spar, notice the four center flush rivets and the open holes just outboard are for assembly with the fuselage.
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  Here is another view of the forward spar, 6 degree bends.
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