Originally Posted by
chagzuki
The paint wore through on the contact areas of my Dahon's frame quite quickly. I think the process would have occurred more slowly if I'd tightened the clamp slightly to reduce any movement, but I think with this type of hinge the paint does tend to abrade. Though I can't see much from your photo.
There's your problem. If there isn't any rust set in, get some touch up paint and have the clamp adjusted properly.