Check where the top section bolts onto the bottom section of the handlebars. See if the rounded part is splayed out. This is caused by not unscrewing the hinge bolts far enough when folding the handle bars for hauling or storing. Best way to fix it is to take it apart and squeeze the sections back to the half-round look. I do them in my bench vise. A large hammer and a red brick will suffice if you can't take the bars off. Put the brick on one side and pound greatly with the large hammer on the other side. And, don't smash yer fingers on the bar or the bolt!