To prepare the hinge for drilling, I measured and drew al line down the middle of the trailing portion of the hinge so I could see it through the holes in the trim tab skin for drilling. After that I disassemble, deburred, countersunk the top holes of the trim spar to accept the dimples from the skin and dimpled all the necessary holes in the skin, spar and servo arms. All I need to do now is trim the edge of the hinge and drill the folded tabs on the ends for rivets.
