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Let's break into a semi-high security ro... > Gaining access to the lock itself - Pg. 87

66 CHAPTER 3 More about locks and ways to low tech hack them stiff and about a 1/32 of an inch thick. I began cutting up a plastic flash drive case that looked to be about the right thickness. The only piece that I wound up using was that small clear piece to the right of the picture. In seeing how the bolt operated in the lock in Figure 3.9, I noticed that if I stop the bolt from traveling that final 1/8 of an inch, the bolt would appear to be deadlock, but it wasn't. If I allow the bolt to go into full deadlock by completing that final 1/8 of an inch travel, the lock could only easily be opened with the key on one side or the thumb latch on the other. Obviously with the door closed, I wouldn't have access to the key on the outside of the door or the thumb latch on the inside of the door. With the dead bolt not properly engaged because of my improvised small piece of plastic, and depending on the tolerance of the door in the doorjamb, I might be able to get a very thin fingernail file or something smaller into the opening to begin retracting the bolt. This would be much easier to show you than it is to explain. If you look at your locks at home from the inside of your home you will see what I mean. Most homes are constructed with a fair amount of an open- ing between the door and the door frame. I have found deadbolts on doors that had no protection against using a thin knife or a fingernail file slipped between the door and the door frame to retract the bolt. I know I've said it before, but I'll say it again. What allows the door to open is the retraction of the bolt.