I didn't do much of anything on the plane today except fixup the dimple at the one rivet that bent over. I used the male dimple die with the rivet gun set to very low pressure (i.e. around 10 psi).

Kerin backed up the dimple with the female dimple die inserted into a hole in this bucking bar.

...and she backed it up with a second bucking bar to give it more mass.

Here's the little doubler plate I made up. One rivet should hold it on fine, but I'm considering remaking it with a wider leg against the rib and actually riveting it to the rib as well. I'll decide later.