[QUOTE 5235046, member: 9609"]well true, more lube would have prolonged its life, but 21,000 miles also suggests it was maintained quite well.
It is surprising when wear sets it how quickly it occurs, I would have had that jockey wheel off in the last couple of months for its routine clean and grease and there must not have been any obvious wear. I noticed the chain starting to clatter against the hang a couple of weeks back (200 mile) and by the time I get round to a replacement it is stupidly worn.
I guess once it becomes rough and misshapen the wear accelerates, would think it would have failed completely in another couple of weeks.[/QUOTE]
It looks like the bush stopped rotating on the pin/bolt, a touch of corrosion maybe?