Online Community of Zenith Builders and Flyers
No amount of turning and moving would fix it so I turned to fellow builder Mike Daniels on this site for advice and after some helpful suggestions I worked out what was wrong. I had riveted the l-shaped bracket the wrong way round to the tip rib.
Hopefully a clumsy mistake now will save me a real one later. Guess I am going to learn how to drill out a rivet.