Completed vertical stabilizer build - Complete fabrication/riveting of rear spar assembly - Allemle fron spar and ribs to rear spar, forming skeleton assembly - Dimple skin - Insert skeleton into skin and rivet skin to skeleton. Bucked interior rivets & squeezed edge rivets using pneumatic squeezer. - Damaged a few rivets on the edge due to close edges of spar caps and doubler. Drilled out bad rivets and re-riveted using modified squeezer des. (Ground down one side of die to allow for fit into the tight space.)