This was all assembled by the previous guys, but the nut plate rivets were proud and the cover panel didn't sit down right. I drilled all the nut plates out and saw that the rattle can primer they had used was pretty thick down in the countersinks. Cleaned the holes out by twirling a countersink by hand in there and took out maybe another thousandth or so. Also cleaned out the dimples that the cover nests into. The lip on the nut plates stuck out into the hole and made it impossible to get the servo in there, so the other day I had ground off the edge of a couple of them. It was still a hassle and you had to clock the servo just right to get it past the rest of them, so before I took the nut plates out I marked the lip that was sticking out on each of them with a sharpie, then after I removed them, I removed some material up to the sharpie marks on the belt sander. They're steel nut plates, so I hit the raw edge with some zinc chromate primer on the end of a q-tip afterward. I gave the nut plate countersinks & dimples the same treatment where I had dressed the holes. Put everything back together & it all fits a lot better now, but I didn't put the screws in yet. There are a couple of other things I'm going to need to do to the elevators before I call them done.