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My spar holder jig came in handy (again)
I used my hole checker (piece of sheet aluminum with a dimple in it) to make sure that the depth of the countersink was OK.
UPDATE: I have received several emails from builders who are having to re-order new aileron spars because they countersunk these holes too deep. They found that when it came time to start clecoing the skins to the spar, the clecos wouldn't stay in at all because the countersunk increased the size of the rivet hole. You may want to do an occasional check by clecoing on a dimpled scrap piece of sheet metal to the countersunk hole just to make sure that the cleco will hold. There is a incredible amount of tension placed on these holes when it comes time to clecoing on the leading edge skin.
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