Main Rudder Spar Installed

Finished riveting the internal stiffeners and joining clips, got the main spar installed and the final riveting in progress. Had to work through several tight rivets both pulled and driven. Have 2 in particular that are gonna be very hard to reach. Broke down and purchased a small 2"x1.5"x5/8" tungsten bucking bar off Amazon. It'll be the right tool for the job and I'll find other uses for it.