Drill aileron skin at ribs. Check that 2 1/2 degree twist is there. 13MM block... forces a twist in aileron.Difficult to hold OB rib and drill at same time. No place to clamp while drilling. Will engage Pam to drill while I hold second aileron. Another set of hands will help.Not installing hinges on ailerons until attaching to wing, for match drill with trailing edge.
