Main spar countersinking
No progress last night on the plane, but I completed my night cross-country toward my PPL. Just one more hour of requirements (simulated instruments).
I got into a groove countersinking all of the #40 holes on the main spar. I was using a thick piece of scrap aluminum with a #40 dimple to test the depth. I finally figured out that wasn’t working very well. Using a thinner, smaller piece worked better. It wasn’t so rough on the back side of the dimple.
I believe I am now ready to rivet the leading edge on for good. I remember reading that somebody put a slight inward curve on the edge of the leading edge to keep it from curling up. I’m not sure how to do that now that the leading edge is already dimpled. There’s no room to get the roller on there. Maybe I’m just being dense.