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@moth
aluminium nipples or brass? If i'm reading the picture right, it's the non-drive side trailing spokes' nipples of a dished wheel that are suffering? So the 'every 4th' pattern is a combination of non-drive side (so slacker to start with) and goes slacker when skidding. Maybe they become loose enough to damage any protective coatings between the rim and nipples, allowing galvanic corrosion to attack.