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Odd. When I too mine apart there was a plastic piece on the nut. Basically a small piece of cut plastic tubbing. Just took it off. Then any basic adjustable (small) wrench worked. It looks like a 4 or 5 mm nut. Not sure why there would be a need to make a custom tool.
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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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