Closed up right aileron. THEN I looked and thought "doh! I hadn't rounded the corners of the mass balancer arm holes (6W12-1). I figure it's not really structural, and the arm isn't even resting on the edges, but I figured I'd better give Zenith a call (email) to make sure my thought isn't out of bounds. I did look at some pictures and videos of other builders to see what thiers looks like. It looks like they didn't round them out either. But, better to check to be sure. "Should I drill out the rivets and round out those 4 corners of that mass balancer arm hole?"