I fully recommend the PVA glue comment by aimee.
Also, looking at the picture, it seems that the kevlar isn't fraying as much as unravelling completely. If it's kevlar like the stuff in the shop here, it's nigh on impossible for that to happen along the edges, but can oiften happen at the end where it's been cut if a strand is sticking out and gets cuaght on something or pulled on deliberately.
Finally, I'd like to ask if it was a new staff when you bought it? from the look of the aluminium edges in the middle of the wick, it's had a lot of abrasive abuse, there lots of little chinks all around it, and they all merge into each other. This indicates to me the staff has hit concrete, rocks or something of similar hardness that has a rough surface. I would say from what I can see 50-80 hard knocks on that type of surface would be required to ching the aluminium so much and so evenly...
Just my thoughts...
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