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i did took it off. the collar is fixed in place. the spring inside is jammed, so there is a gap between the two parts.

hello everybody.
i own a '78 525 and today the right side miror has "jumped" out of it rotating base and now it is rotating freely from side to side and not locking in place.
i hope i'm describing it corectly.
did anyone had this problem before?
is there a way to fix that?
if not, where can i buy a ...