Brief Description: Inboard Wing, Tank Z Bracket, Nut Plates.
Riveting these inboard wing nut plates under the wing main spar was a real pain. They are under the holes in picture 1. Flush rivets on the forward side of the main spar hold the nut plates on the trailing side of the main spar. Getting flush rivets set on the forward side was a bummer. It requires a bucking bar between the ribs on the training side. I blew it several time and had to drill them out and try again. It's easy to drill out a flush rivet.
