Marked the spacing on the bottom skin edge. Used a #40 drill to drill through just the skin and then aligned the center of the channel and drilled it as well. Level checked at each channel as the drilling went down the channel. Once drilled, the trailing edge is replaced and the trailing edge is match drilled through the previous drilled holes into the channel. #10 screws were used to temporally attach the strut bracket as not damage the real fasteners. The nose skin was set on the wing and aligned. Once aligned the holes were drilled through both into the spar.
