Finished deburring and dimpling skins! Countersunk the trailing edge triangle R-916. Love my single flute countersinks from Cleaveland Tool. Hopefully you can see in pic 2 how polished the countersinks are. Also note the fine shavings left behind, not little granules. One of the best decisions I made in this build was to buy two countersink cages, one for #40, and one for #30. They are both set perfectly and I can use them right away with full confidence, and not having to recalibrate the cage each time.