Started deburring the F-770 side skins. I also match drilled the hole in the skin that matches the hole in the F-715 end seat rib. You may recall that the pilot hole for this is mis-located in the skin vs. the rib, i.e. the pilot holes in the two pieces are off by about 1.5". I had talked to Vans about this and was told that either location was acceptable. Since I had already opened up the hole in the rib, I had previously reached in through the lightening hole and marked the location in sharpie on the inside of the skin. When I pulled the skin off, I used that as a reference for the hole in the skin, but made it undersized, then re-installed the skin and final sided it with a round file to make sure they lines up exactly. I will follow the same process on the other side when I'm deburring it. I created some extra work for myself here and should have just held off on drilling the original hole in the rib, then it would have been much easier to just match drill both pieces from the outside when they were all clecoed together originally.