I'm waiting for some help to mate the center section to the tailcone, so in the meantime I went back to one of my time-filler tasks; Finished up the seat backs today.

I had already match drilled and primed all the angles, so I thought that this would be relatively quick, but somehow time always seems to get away from me in the shop. One thing that I wasn't happy about was how the upper edge of the seat skin fit with the upper lateral angle. You are supposed to radius the vertex of this angle so that it nests properly in the radius of the skin, but they weren't really fitting very well.

Turns out that the issue was caused by the skin not being bent to a true 90*. I made a quick temporary break by clamping a piece of angle to the table and just bending the flange by hand with some aggressive thumb pressure. After a couple of attempts, I got them both fitting much better.

Squeezed all the rivets on these with the exception of the upper piano hinge. On that row, I tried an experiment; squeezed them with appropriate sets in my DRDT2. Worked great!

I went against the normal convention of rivet orientation here and elected to put the shop head aft, which meant it was on the thinnest material. Worked out okay, and this way the shop heads won't be rubbing against the seat upholstery or maybe even a parachute pack if I ever have a reason to wear one.

Fabbed up piano hinge pins and secured them with some .032 safety wire through a couple of #50 holes I drilled to match in the adjuster flap on the seat back.

Project done!