I've noticed that the nut that holds my wheel into the dropout had gouged the paint off (and looks as if it has take off a small layer of the metal) in the shape of the nut on both out sides of my rear dropouts. I changed the gearing the other day for a time trial race and when I took the wheel off today it has gouged off the paint in another spot on the dropout (this one isnt gouged as deep though). I have a Steamroller so its steel. I was wondering if this is normal? the bike I had before this didnt goung the hell out of the dropouts and I'm worried that I will have to eventually buy new dropouts and have them welded on, which I dont want to do. Will this be fine or is there something I could put between the surface of the dropout and the nut?