Match Drilled VS-1212A-R lower spar cap, VS-1212B-R upper spar cap, VS-1202 front spar to VS-1203 rear spar and deburred all. Machine countersunk VS-1203 rear spar, VS-1212A-R lower spar cap, VS-1212B-R upper spar cap, and VS-1202 front spar for 3/32 rivets.