He let you work on it as a good samaritin... it's his bag end of story. If it goes to small claims court the Judge will rip him a new one and maybe award you some money from him for your time. I am telling you this from experience. I used to help people out of ditches during snow storms. Once a tow strap broke and dented a guys car, He then sued me. In court the judge ripped his ass bad, I mean bad he basicly called him an ass&^%& himself and awarded me $100 for my time. The big thing was I never asked for or accepted monetary compensation. Don't worry about a thing this guy is just an idiot.