I trimmed the left nav/strobe light fairing. I drilled holes in the flange of the fairing and match drilled holes into the bottom wing tip closure. I mixed some Bondo and spread a thin layaer on the fairing and clecoed it in place. After the Bondo was set I removed the fairing and sanded the Bondo to conform to the fairing. I drilled the edge of the fairing and match drilled the wing tip rib. I used the deburring tool to countersink the 6-holes in the edge of the fairing for the CS4-3 flat head riverts.