I needed to locate the three nose ribs at the root end after the wing root doubler was installed. The nose ribs wil be fastened with angle pieces to the spar web, but first had to be located properly and that meant locating the hole in the spar cap that will align with the leading edge and top wing skin. I put on the top skin and wrapped the LE skin around and clecoed in place. Then drilled holes in the spar cap extrusion to mate with the holes in the skins.
