Hi there: I'm having an issue with the driver side vent window on my car. It produces a lot of wind noise because the window itself will not close completely, as if it is out of adjustment. The open/close crank does work, but there is a huge amount of slack at each end of the travel, as in when you crank back the other way you have almost a full revolution before the vent window begins to move so I am delicate with it. I attempted to push the window fully closed by hand with moderate pressure and it refuses to go. Any advice? Thank you.