Hard rivets to set

Was wondering what fellow fuselage builders did here.



I can't figure out how to set the top rivet and the top rivet of the nutplate. I have a tungsten bar and it is even too big to get in the confined space. Did anyone just use a flush pop rivet here?

Pop rivets are fine there. All they carry is the torque from turning the screw.

I believe I used a 3" longeron yoke (http://www.averytools.com/prodinfo.asp?number=7755), possibly with an oversized (thicker) flat die on the inside. Hand squeezer gives a little more control.