On my 88 K5 blazer I need to put new weather stripping in my vent window. I removed my door panel to access the spring and nut which holds my vent window in place. There is only about a 2" square hole in the inside of the door where I can barely fit a wrench in to loosen the nut. It seems there is no easy way to remove this nut. Does anyone know how to remove the vent window?