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3
  • I've read about this problem in reviews of OnGuard locks on Amazon, so it's likely a design flaw with rust as a possible culprit. I haven't read about any solutions to it, beyond renting a power grinder to cut the lock off so you can buy a better one next time. That was one of the reasons I chose not to buy OnGuard, the other reason is one key fron an OnGuard lock fits multiple locks, which would allow a bike thief to walk around with a large key ring trying several keys until one of them works (the cheaper Kryptonite locks also have this problem).
    – Robin Ashe
    Commented Jul 3, 2012 at 22:25
  • I'd try first putting it in what you believe to be the unlocked position, then applying a hammer in such a way as to knock the pieces apart. Failing that, an angle grinder. (If there's a Harbor Freight nearby you can probably buy one for under $20.)
    – Daniel R Hicks
    Commented Jul 4, 2012 at 1:28
  • Related: U-lock stuck on a bike
    – Goodbye Stack Exchange
    Commented Jul 4, 2012 at 3:57