I need some help with the passenger side power window on my 82 633. It's not operational, but I can hear a faint click as power is supplied to the motor, but nothing's happening mechanically. I've heard of the old "firm fist on the door panel" trick, which has worked a few times in the past, but now no matter what, it won't come down. Fortunately, it's stuck up and not stuck down as colder temperatures arrive. I'd really appreciate any and all suggestions, experience, etc. on fixing the window, so my passengers (namely, the female in my life) don't make me feel like an idiot for not having fixed this sooner. TIA, James