Thanks x5Alpine, will do. Is there any way of getting the chain guides looked at (inexpensively) to see how worn they are? I know that whole job of guides and tensioners replacement is a matter of 'when' rather than 'if', but I'm wondering if there's a way of investigating current state to see if I can afford to wait another 5k or 10k miles or if it's an urgent thing that needs to be done (and I therefore have to find the $s ASAP!)