They turn smooth when clean. The tolorances are tight, so dirt/ rust can make them a little harder to turn. Clean again if they are. In 3 years I had one of them lock on me, doing maybe 5-10mph. But it was dirty and rusty inside, and who knows if I fully had it turned to free. This was the day after finishing the Rubicon, after driving freeway for 3 hours back to the start. Worked fine until I was a mile out of camp. Just weird, pulled over, turned to unlock, and was fine. Also, gotta remember that running a locker will make them hard to unlock. Turn the steering wheel back and forth, maybe go in reverse a couple feet while sawing will make all the difference in the world. Impossible to turn sometimes after real abuse unless you free up the locker