I have an issue with the driver's door window. Since purchase it makes a clumping sound at a point in rolling it up. There was another person on the forum, that expressed the same problem in a post(some time ago). I never did know what the problem was, and didn't find the post since. Has anyone had this problem? If I just go in spurts rolling the window up it do not seem to do this or as much. I am not for sure what is meant by regulator?

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Rebe