On page 10-20 the rivet call-out for the rudder stops (F-14113 L and R) is an AN426AD4-6; a flush head rivet. That makes no sense given that the holes are not countersunk, and there is no way to countersink (at least 2 of the 4 holes) given how close they are to the other leg of the angle. Is this a typo? Should it be an AN470 rivet instead?