I noticed that when I was flying my model 4 speedster the plane wanted to dip down to the right when at cruise. So when I folded the wings back I noticed that the right wing is lower than the left by almost a inch. But it was level all the way back to the mounting bolt. I don't see how to bring the wing up to that they are same height. Everything appears normal when they are open just when their closed do I see the different. they are straight but one wing is lower that the other. What can I do?