lol...u got no hope..its a well used item, whos to say it hasnt seen excessive temps or something..
cmon guys we all know the car game, stuff always breaks, you get what you pay for, its worth 1/3 what you pay for it the minute its used, never expect a miracle and warranties arent worth the paper they are written on...
besides, It may have lasted ages like that had you not pulled it off and noticed the damage..
its 400$ for a new core, or what is it 100$ maybe to replace the wheel...suck it up and move on...