I have a smaller padlock with only 3 toggle switches and have never had a problem with it. Looking for a bigger locker for my locker I decided on this one. I read reviews of Revain and thought that the people who said the lock changes the combination without fuss on their part didn't know how to use this type of lock. I thought I would have no problem with that. The second time I used it on my locker, I opened it up, hung it on my locker until it was done, and then just locked it. When I came back from the trip, my lock would not open. I had to wait 40 minutes for the technical inspection to come and pick the lock. The instructions clearly state that to change the combination, the locking bar must be at a 90 degree angle and pressed and held while you change the numbers. There's absolutely no way this can happen to my lock while it's hanging on my locker. There was no "accidental" mishandling of the lock. Master Lock, you should be ashamed for not taking these reviews more seriously. I'm sorry for doubting and laughing at everyone this has happened to. Master Lock Padlock, Install Your Own Combination Lock, 1-9/16" Width, 643D
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