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I find that it's very difficult (too difficult to bother with) to get a single length of cable wound correctly in each direction on the drum such that when fully wound in one direction the window is fully up and in the other direction fully down without running out of cable on the drum, while maintaining correct tension on the cable, etc. There are also wracking or twisting loads that the cable puts on the regulator, frame and door frame to deal with. The glass window is also probably curved in 2 directions and it has to be adjusted to correctly ride in the track and close at the top correctly. Also, over time the cable probably gets stretched a bit. I figure that's something some guy named Hans or Dieter could have done in the factory but not afterwards. My passenger side window was never screwed up by anybody and it's operation is perfect.
What I've found that works and which allows you to adjust the tension is to use 2 lengths of new cable. They can be wound on correctly and the tension adjusted, you even have extra cable in each direction to adjust how its wound on the drum so it works at the top and bottom of the window travel. The excess cable can be trimmed off later when your satisfied that everything works. When it's about 100 degrees in the summer might be a good time to adjust the tension and take the slack out from the cable lengthening due to temperature.
This way, but now not quite requiring the patience of a Zen Master, you can fix your window mechanism and not use any bad language.
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