I did a forum search and came up with nothing so I thought I'd ask the experts. I'm about to finish up riveting the rudder trailing edge after the epoxy dries. The construction manual says to back rivet the shop head flip the rudder over and use a mushroom set to finish up the manufactured head. Before I blast ahead on this .016 skin, does it mean to use the back rivet (plunger type) set or mushroom set on the whole trailing edge when back riveting. Also all I have is a 3X gun would you recommend investing in a 2X gun for the tail feathers. Thank's gents..