I had a similar bad experience with the same cheap chain tool as ebay user simontoogood who also wrote a review on this item, bought off a powerseller on ebay. I had to rivet a 530 chain and this was supposed to be able to do up to a 630. No chance!! The tool was smaller than i had expected and very light, so i had my doubts straight off. I emailed the seller who assured me it would do the job. I used a socket and ratchet on the end since it was difficult to use the flimsy rod handle. I tightened it very gently and gradually, but the rivet rod just snapped in two without even touching the rivet on the chain. This ability of this tool is being falsely advertised on ebay. If you have a heavy chain, you need to spend the money to get the right equipment.