they also have an extension kit on ebay that does the same thing. i believe Alba makes it. just delaying the inevitable IMO. if you dont want to by a manual one, there is a thread on here that takes you step by step on how to turn your stock one into a manual tensioner. looks pretty easy.
Do not extend your tensioner. It was designed that way for a reason. If there is not enough tension left, it's time for a new chain. If you extend the tensioner and the already stretched chain stretches more you run the risk of it breaking. Then you've got major problems on your hands.
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