Drilled out rivets in inboard main rib and re-riveted.
Marked skins with proper rivets since Vans specifies 3 different rivet sizes - -3.5 for ribs to skins, -4 for skins to spars and -4.5 for skin/rib/spar.
Started riveting skin to spar. About 1/2 done.
Next - finish riveting skin to spar. Rivet main ribs to spar. Save outboard rib for last do make bucking easier.
