Welcome to the Wicked Edge Forum, sulaco.
This is what TCMeyer, one of our regular Forum participant and contributor did to solve tis same issue.
I gave copied and pasted this from his original post:
“I was then surprised to find that these rods, at only 0.002″ bigger in diameter, wouldn’t move freely through the bores in two of my ten handles. It seemed as though something was obstructing the bores about midway through the handles. I did a bit of digging through my shooter supplies and I found a fresh bronze .243 rifle cleaning brush. I mounted it to a single section of cleaning rod and again, using a cordless drill, pushed the brush into the approximate center of the handles, gave it a few very short spins and was amazed to see how quickly bits of plastic began to show. This instantly solved the problem and all the handles now work smoothly over the new rods.”