I've used this method to pre-empt regulator failures on our E46, and also used it on the X5 on a regulator that was just starting to give symptoms of failing. This is a great technique, and if my experience is any indication, it's permanent, and in fact better than the original attachment that comes on a new regulator.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT