Riveted the rear spars to the wing ribs. I tried to use the squeezer but it was cumbersome with several different rivet sizes and with the flanges in the way. So I switched to the gun. This was much easier.

And of course, no section is complete without a few mistakes. I used the wrong size rivets in ribs behind the doublers. I used 4-4’s and needed 4-5’s the shop heads were too thin to be acceptable. So I drilled them all out. Nine rivets in total. I couldn’t punch the rivets out because there was nothing to back them up when I hit them with the punch. So I had to drill them all the way out. I was super careful but the holes are enlarged ever so slightly. If this wasn’t a critical structure, I’d probably just re-rivet it but this area carries the load from the ailerons and flaps. So I’ll go with a larger river to ensure structural soundness. I order some -5 rivets, a #21 drill, and a 5/32″ rivet set from Spruce.

I also put in an order with Van’s for some fuel tank sealant.