I had a bit of trouble with my Kryptonite lock but then I used compressed air to clean out bits of dirt. I added a couple of drops of bike lube into the u lock wells and that seemed to sort out the jamming. I use two different locks and I have to remember not to force the wrong key into the lock. That's not good. All in all, I'm happy with my NY Fagedaboutit (or whatever it's spelled).