Bicycle Lock (Special Opening Technique Required) (Pilton EH4)

It's quite easy once you get the knack of it, but you mustn't forget the special technique required to open it or you will be wrestling with it and getting frustrated at how it appears to randomly jam and then suddenly open for no apparent reason. BUT THERE IS A REASON and it's totally logical and reliable when you understand it. THE TECHNIQUE is to turn the key all the way round, and then - crucially - bring it back a tiny bit. That will release the mechanism and it will open flawlessly, time after time.