Removed Clecos from trailing edges of both elevators and riveted them together. I use the same "special ground" rivet sets on the left edge that I did on the rudder with poor results. I'm not sure if I spread the proseal too thick or just what the problem was, but nearly every rivet shows the squeezer set marks. I went back to Van's method of backriveting on the right elevator with really good success. I really like to squeeze rivets wherever possible but I gained alot of confidence back riveting the right trailing edge.