Turned wing over. Prepped and primed upper skins. Installed hinge ribs. This was the most challenging riveting task so far. The rivets are so close to the rib and spar it is difficult to set them. Used the close quarter rivet puller but still needed the wedge tool to get to the rivets. The rivets called out here are too short - replaced them with 4-4. Also had a problem with primer reducing size of holes so rivets wouldn't fit. It is difficult to access the holes with a drill or reamer to clear them. Eventually used a 12" drill bit, bent to keep the hole straight. Will clear the holes in the brackets before installation on the right wing.
