Riverside3
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I used a guide fitting to countersink the wing main spar fuel tank screw holes. While working the inboard most hole on the top, the fitting came loose resulting in a jagged, starburst shaped hole...a very short, quick chatter cut. The #6 fastener will sit flush in the space but I am concerned that cracks might develop in the tank overlap at the fastener point due to the jagged fit that the hole offers. I'm thinking, better to finish the hole out to a concentric shape and then introduce a semi-rigid spacer, rubber washer, during assembly to make up the space. That, or just over dimple the skin and have the fastener run in the extra distance.