After test fitting the trim tab again, (can you tell I am concerned that this turns out well) I primed the ends of the trim tab and the area where the control horn get riveted in place. The riveting along the bottom of the elevator was a little cumbersome; I used the longeron yoke on the pneumatic squeezer. It is a tight fit so I had to take the top die off the yoke insert in over the trim tab spar and then reinsert the die, once done the yoke stays in place until all the rivets are set, there is not setting the squeezer down. The control horn rivets that are interior of the spar I was able to squeeze by spreading the trim tabs halves apart and approaching them from the end of the trim tab. You have to be very careful here as you squeeze that everything is aligned.
