I forgot this entry from a couple of days ago.  Finished up the rivets at the bottom of the rudder.  Needed a way to rivet the ones close to the cable attach piece because I really couldn't get the rivet gun flat against the rivets to properly pull them.

Bent the rivet mandrel slightly.

Made this piece so that the rivet is pulled flat.  The drilled hole is angled to match the angled surface on top.

The bent rivet mandrel fits through the hole.  Now the surface against the skin is flat and the rivet gun is flat against the angle piece I made.

Perfecto!