I finished riveting the left flap this morning. I riveted the spanwise row of rivets that connects the spar to the top skin and finished riveting the end ribs. I didn't use blind rivets in the outboard rib because there was room to drive AN-4s in there, plus I'm out of LP4-3s. Otherwise it went very good. I left the bottom of the spar unattached as I want to avoid screwing up the flap hinge so that will be done when the flap is fitted to the wing. Now on to the right flap.