Keep going with rivet the last three rivets on the top trailing edge of the rudder. Still not enough room to do the last two opposing rivets. Finally got rivets driven! Ground down a steel chisel and got it wedged in enough to set rivet. Just a little rivet head edge on outside. Used flush rivet head to ‘tap’ it down. All rivets are driven and no pop rivets used on the narrowest part of r-903 tip rib. Lesson learned with rivet gun – turn up the pressure and hit it harder to begin with. Don’t be too shy
