Has anybody bought one of these of ebay 
  http://cgi.ebay.co.uk/Delux-H-Duty-M...3300  43306891  Are they any good, would you recommend them, the price seems good but as with most thing you usually get what you pay for. 
 Is rivetting a chain a difficult job, does it have to be perfect or do you run the risk of the link failing and the mayhem that could follow or would you recommend getting one fitted by your usual mechanic.