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Old 2010-05-21, 05:45   Link #3730
SaintessHeart
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Join Date: Nov 2007
Age: 35
Quote:
Originally Posted by felix View Post
#Q: Why are some locks made to lock twice (two turns)? Any history/reason behind it?
With a strong but thin enough steel plate/ruler, you can lever out the lock with the latch which only has a single lock function through the gap between the door and the frame.

The double locking mechanism makes that impossible to undo the lock and the latch at the same time.
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