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Countersunk the spar for the fuel tank screws
I tried a different approach on these countersinks as well. This time I set the final depth of the countersink on the Microstop Countersink after a trial cut. Then I started cutting the countersinks using short bursts with the drill. Right away the countersink bit danced wildy around in the pre-drilled hole and look like crap and not perfectly round. Right before the final finish cut, I held the countersink very gently against the hole, just barely touching it, and let the drill rev as high as it go. This made the hole perfectly round, where before it was getting badly distorted by the initial countersink. Then I checked the depth of the hole by using a scrap piece of aluminum that was the same thickness as the tank skin, with a #8 dimple in it.
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