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You need a 15mm box wrench attached to a piece of pipe to make it about 16 " long. Fit this over the tensioner nut and pull it forwards about 5-8 " to loosen the tensioner. - I made mine by cutting off the other end of an old box wrench and fitting a piece of 1/2" mild steel waterpipe over it. There is no easy way to get a wrench in there without this adaption.

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10y ago

What else can I help you with?