This session's task was to install the second rib (first full size rib) in the left fuel tank. This honestly went much smoother than the previous rib, though it became much easier when I started using a pointed awl to help align the holes with the skin. Only one of the rivets had to be drilled out and reinstalled, because I noticed that it wasn't sitting completely flush with the skin surface while cleaning up the excessive sealant that had squeezed-out. Overall, this rib was much less messy to install than the first one--maybe because I didn't go quite as extreme with applying the sealant.