+1 When I sold my old Eclipse before I moved from Los Angeles to Pittsburgh, I wrote up a simple one line agreement. 1990 Mitsu eclipse vin #xxxxxxxxxxxxxxx, odo reading xxxxxxx was sold to “Jose Garcia” for $1000 AS IS. And we both signed and dated it. I made a copy of it and that was that.
I think it would be hard for him to do anything about it even in small claims court. F him. You have done enough. While you are at it maybe you should write it all down and put dates etc just in case he does think he can take you to small claims.