Bruce,
Thanks for the repy - I had a good look at it and the cable seems fine - it's definitely still square, as is the male end on the tiller side.
Do you have any other suggestions? Is the clutch worth looking at (the trimmer's a couple of years old) and is it a difficult job? As I said, whilst I'm no mechanic I'm moderately competent at taking things apart and putting them back together...
