Nut plates have been added to the rear and front spars. I had my first opportunity to drill out a rivet. Turns out the rivet wasn't bad, it just wasn't attaching anything together. Somehow, I had bumped a clecoed nut plate such that the rivet didn't go through the hole and when I set the rivet, the nut plate simply fell off. Drilling it out wasn't too bad, but I dread the process when I have a partial airframe to navigate instead of easy-to-move bench-sized parts to play with. Can you tell which rivet was re-worked?