I have a Stihl KM 110 R that I use a curved shaft edger with. I love the edger and it does a really good job but the shafts in the edger keep fraying at the end where it engages the motor. The super dealer I have has replaced twice free. I have disconnected a few times to put on the hedge trimmer attachment. I am inserting it all the way to the line and the dealer checked the alignment with the motor and found no issues. It frays right at the end and then will not go into the motor at all. Anything you guys think I am doing to cause this? The last shaft they installed looked to be a better design and they double checked to make sure it was the right part number. Anyway is anybody else having these issues?