My XBOX 360 controller has mashed buttons. Not sticky or stuck but just mashed. I read online that a tool can be used to open the controller and fix the buttons. I know that you don't really need the tool, but its cheap so I think its worth the money. I looked on Amazon, but reviews say that the tool either works great or not at all. I need help getting the right one, so can anyone direct me to a place to get the right one?