Round key extends six pins at different distances, which allows the lock to turn. The lock initially worked perfectly. After a month it became difficult to unlock. Lubrication helped for a week. The pins have a soft seat and the return springs are too weak to push the pins out. After six weeks, I sometimes had to wiggle the pins with a paperclip to pull them out far enough for the key to move them the correct unlocking distance. When I was two months old I put the key in and turned it but then it got stuck and the key wouldn't come out. The key now covers the pins and no wobble will allow it to to turn. Now the lock is useless.
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