If you do have the GI type sling and the keepers have, or are stretching, all you have to do is cut the threads on the keeper, then move the holes over/inward one hole (maybe two) from being aligned, and then restitch with dental floss. Good as new and even better. I actually do this with any new sling right off.
“The enemy is anybody who's going to get you killed, no matter which side he is on.”
― Joseph Heller, Catch-22