I'd be inclined to get the bike taken over to the dealers, Nylock's don't come off like that for no reason (possibly it wasn't there start with?), on such a new bike this should have been picked up at PDI, or 600mls either way I'd be wonerding what else had been missed and looking to the dealer for some, 'er, 'advice' either way I'd get the dealer to replace it under warrenty, just in case.......

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Never underestimate the power of stupid people in large groups.