Installed A4 rivets in the slat skin and ribs on the bottom side of the skin. Cleco and rivet the doubler inside of the R/H inboard slat skin with A4 rivets. On three of the five slat ribs cleco and rivet the slat pickup to them with A5 rivets. Cleco and rivet the five slat ribs to the bottom side of the slat skin.