Mark and "cut" the trim tab pushrod slot in the lower left skin. Without a decent 9/16" hole saw, i have initially drilled the three marked locations with 1/4 bit . Then i drew the 9/16" circumference before finishing the rest of the outline. NOTE: i have misplaced an essential tool required for the Dremel cutter and hence got to postpone the cutting phase to a later date until i find the missing part.