I recently noticed a screw in my 2017 Subaru Forester original tire about 1/2 way between the sidewall and the outside groove (still where the rubber meets the road). I had no dash lights, just visual observation. Stopped by the dealership on the way home and was told they considered the "sidewall" to be side to the first groove. My only choices at the dealership were 4 new tires (so they would all match in size) or a shaved tire which would take a week and was more expensive than a new tire. Car at 24000 mi. Is this a new definition of a sidewall? Does Subaru have a Road Hazard warranty available for their tires? This could get to be pricey quickly.