my buddy slipped on the ice and tried to brace himself on my rear hatch, but he hit the wiper off to the side. I can move it around and put it back in place but it wont work on its own. and also when i start driving it shifts so it goes off the car. now i just positioned it all the way down so it wouldnt go off the window. Everything is intact but i assume i would need a new one. How much does it cost to get a new one? Is this possible to fix without buying a whole new rear wiper motor and crap like that?