The caps and seats deteriorate from UV over time (but the rivets may not be loose if there is still an undamaged portion of the seat between the FG and rivet head) -- The perfection solution is to replace the rivets, seats and caps (Actually, the real perfection solution is to replace them all), but if the rivet isn't loose, the Good-Enuf solution is to put a dab of white silicone over the rivet and seat to shield the seat from further damage and seal the rivet from leakage.
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