Hi all. While attempting to install the F-704G Shear Bar to the F-704B Center Section Back Bulkhead via back-riveting, I apparently was not holding the assembly to the backplate and got a proud rivet. Drilled out but in the process probably enlarged the hole. Now I can't get the rivet to set because all of the expansion takes place in the long -14 hole and I end up with no shop head. Any suggestions?