Having a tough time getting some rivets installed on the tailcone. I can't figure out how to get a bucking bar on the tails. The locations are the back side of F--01411 and the forward side of F-01412 - at the bottom where they attach to the lower skin. What have you guys done to set these? Sorry I can't post pictures but it's page 10-18 steps 7 and 8. Any advice would be great.