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Possible cause
I have a Ryobi, and in the early days of ownership found that the cord used to break off at the eyelets where the cord came out of the head. It appeared that the rough surface of the eyelets was creating cracks in the cord, and therefore breaking prematurely. I polished the eyelets with a bit of fine wet and dry paper, and never had a problem since.
Hope this helps someone.
Alan....
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A couple of years on and my Kawasaki head finally wore out. I've now installed a Speedfeed head, but can't see it lasting very long. I have a rather rough block to maintain and the plastics look really soft and are showing a lot of damage already after just a couple of cuts. The head is quick to load, but it also is just as quick to unload! It is a very profligate dispenser of line. I've used as much line in a couple of cuts as I usually use in a couple of years!
It's probably nice to use on a flat suburban block, but it has its drawbacks on a sloping rocky block!