Has anyone had experience changing the window channels on the 123 cars? Mine are so worn that the windows (driver and passenger side front) rattle and there is wind noise at highway speeds. I did this job years ago on a manual window MB, and I don't recall it being all that difficult, but I wonder if there are things I should be aware of before I start on one with power windows. Any help would be appreciated. My car is a 1979 300TD (station wagon). I am assuming that the windows need to be loosened, possibly removed, to complete this task. Am I right? Thanks.