I primed the top surface of the right spar. I just used notebook paper to mask the spar.
I match drilled the tie down bar. The spacers still require some work. 
I clecoed the ribs to the main spar in preparation for riveting. The rear spar was left off so I could bend the ribs out of the way.
I riveted the ribs to the main spar. I used the offset rivet set to get between the ribs in a few locations.
I clecoed the rear spar to the ribs.
