Primed Rudder Spar (R-1202) and Ribs (R-1203). Dirlled out defective nutplate rivets from V-Stab skin and replaced. Disassembled V-Stab assembly for inspection by EAA Technical Counselor, Claude (Buz) Rich. He inspected the V-Stab assembly, Rudder Hinge Bracket, Spar Caps and Main Ribs. No problems were noted. V-Stab reassembled for riveting. Got help from Steven.