When I got my Dahon Curve D3 I checked after the first couple rides for chain rub. I guess I should have kept checking. By the time I finally noticed it last week while changing a flat, its been almost 3 months since I last checked. There is a gouge deep enough to have depth, but it doesn't go all the way through the metal. Is the frame wrecked? Or can I just put a washer on the axel to add some space and it will be ok?