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The reason is pretty obvious I guess, the fixing of the outside black "plate" is rubbing on the paint, when it gets to the metal corrosion can start. Got to check on mine...
Then again, if the part is zinc plated this should not go further, there will be one corroded "spot" and nothing else. That again makes me think it won't be a corrosion warranty case (as only perforating corrosion is covered AFAIK)
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