The trailing edges of both the left and right R-901 skins are dimple countersunk and both sides of the R-916 rudder trailing edge are machine countersunk. These rivets will be double flush. The shop head actually turns out looking pretty nice when it is driven into a dimple. Prime all the components desired.
-> I match drilled the skins to the wedge using a drill guide I fabricated.
-> I then used the axe wedge tool from Cleaveland Tools to countersink the wedge. I turned out pretty good. A couble of holes are 3 leaf shamrock like, but the far majority are symmetrical and well formed.
