My dad showed up about 9:30, we went to work drilling the left side of the HS. At about 12:30 the left side was ready to drill. I decided to drill the holes for the leading edge of 405 that also go through 404 from the 404 nose rib side. The access was better and I was able to assure a centered hole. I also tried flexing the drill bit for the first time. It works well.
