Installed the nutplates for the aft fuselage access covers (the ones under the horizontal stabilizer on each side). I think these covers are the only external items on the whole airplane that use non-countersunk hardware. It would have been possible to make them flush, but frankly, I just wanted to get the job done. At last, a project I accomplished that was totally stock! [Superseded in 2023 into non-stock covers!]