You can't go wrong if you follow this guide. Bases professionally sprayed :-) Fortunately my mirror supports are in good condition but got a coating of waxy grease on refitting anyway.
BMW Z3 Mirror Base Refurbishment
This guide is mainly for those BMW Z3 owners among us whose mirrors are so badly corroded they cant be twisted to access the bolts. Theres no extra work per se but the removal process is somewhat backwards
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