Vinnie Silber posted some good advice on how to prevent grip lock.
___ Repost of my advice from 2018:
Most male gymnasts are well aware of the terrible injury that can occur if leather touches leather around the Bar. If there’s any chance at all that the grips have stretched that much, they must be replaced.
I like the title of that article by Ten-O Gymnastics.
Mark Van Wyk had his gymnasts toss their old grips until they got hung up on the rafters of the Gym. Grip Heaven, they called it.
related – Human Kinetics – Grip Lock: A Unique Mechanism of Injury in Gymnastics
It happens on women’s Bars too, but very rarely.