Tonight's session worked on fixing the discovery I made yesterday that I had installed the splice-strip ribs on the Outboard Leading Edge (OBLE) wing sections on the wrong side and flipped. This caused the rib webbing to be facing outwards rather than inwards, To fix this, I had to drill out the approximately 30 flush rivets in each of the two ribs, flip and swap the ribs, and then rivet them back in properly. In any case, I got a lot of flush rivet removal practice and didn't need to upsize any of the rivet holes. Installing the new rivets was pretty easy since the correct orientation allowed me to just use a hand-squeezer rather than the bucking bar with rivet gun. After getting the two ribs fixed, I did a test fit of the stall warning switch and things are indeed much better, but I think I may need to refine the opening slit in the skin a little more. The vane that protrudes through the slit was a little close to one side of the slit, so I think I'll need to take some time later to make the slit a little longer. What's next? I'll look into enlarging the slit, but perhaps I'll just set that aside for later... I do need to back to closing up the fuel tanks, so maybe that'll be the next project.