| Hub Grinder
Top tip guys, check your cush drives when you check your chain. If they come out they will grind your hub assembly down and then start on your swinging arm. Any sign of metal swarf on your back wheel check immediately!
My hub assembly has been ground down to next to nothing and is very expensive to replace, £230 + vat. Add to that new cush drive, sundries and labour and we are into £420 ish.
Another tell tale sign is when you try to adjust your chain there is next to nothing for the c spanner to get a hold of. | 
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