• Had exactly the same problem today. Only just seen this thread, JC summed up the problem. I assume the problem is from when the key is either removed after locking or when I tried to unlock

    somewhere I once read it's best to apply oil to the the key and to lock and unlock a few times. They said that's the best way to oil a sticky lock. Spraying oil into the mechanism can caused it to clog up with dust and grime. Not sure if this also applies to bike locks.

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