MATCH DRILLED ALL STIFFNERS TO SKINS, RIGHT HAND SIDE ONLY,DEBURRED AND DIMPLED AS PER INSTRUCTIONS. PRIMED ALL STIFFNERS AND INNER SKIN, ALSO AS IMAGE 3 SHOWS, I ETCHED AND PRIMED THE OUTER LEADING EDGE,SO AS WHEN I ROLL THE EDGE, I WILL HAVE PRIMER BETWEEN THE LAP OF THE SKIN.