I've got most of the work done on the rudder, but I can't quite figure out how to countersink/dimple the last holes on the ribs. I've been dimpling, then lightly countersinking all the others in order to make room for the dimple in the skin above it, but I can't get a dimple dye in there. I believe it .040" aluminum, and when I tested a countersink of the required depth on the same type, it went all the way through the metal. So, do I just go ahead and countersink it anyways (I'm afraid it will crack down the line if I do, they seem to be in a fairly high stress area) or is there some way I can dimple it?
Its the last three holes on either side of both the top and bottom rib:
![](/proxy.php?image=http%3A%2F%2Fimg80.imageshack.us%2Fimg80%2F5753%2Frudderribsyn3.jpg&hash=512de99dd5cbf6d61292a28ece394ad2)
Its the last three holes on either side of both the top and bottom rib:
![](/proxy.php?image=http%3A%2F%2Fimg80.imageshack.us%2Fimg80%2F5753%2Frudderribsyn3.jpg&hash=512de99dd5cbf6d61292a28ece394ad2)