I have a 1968 180D. The right wing is heavy. The ailerons are rigged correctly, but would like to lower the right flap a tad to raise the right wing. How can you adjust the flap. I saw the screw on the inboard trailing edge but can't get to it. Does that screw/ bolt have to come out to access the turnbuckle. I'm cornfused. I can't access the screw. Thanks in advance for any feedback. Great site, I'm glad I ran across it and became a member.