I have a 1973 Mercedes 280 SE4.5. I am having a problem in closing the windows on front left and right windows. The windows leave an open gap about one half inch on top. I suspect the regulator. I have no instructions on how to remove the door panels. I suspect that there clips involved. Appreciate if someone could describe the method of taking off the door panels. I don;t wanr to break anything because of my ignorance. By the way I bought regulator kits because they were cheap. Not viewing the problem should I have bought the two regulators?