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Frequently, locksmiths gain entry into locked places by impressioning or picking open a lock. A good locksmith also can gain entry through special techniques called Emergency Entry Procedures (EEPs). It might not seem like good locksmithing practice to force a lock open, but economics, time, and other requirements may make it necessary. In an emergency, or when a lock resists picking and impressioning, the EEPs are used. Even though you may rarely use EEPs, you need to know them to help make buildings more burglary resistant. As a professional locksmith, you should have the proper equipment to make emergency entries as quickly and neatly as possible. Some entry tools are sold through locksmith supply houses; some tools you can make yourself. Experience will show you which tools and techniques work best for you. Several preliminaries should be undertaken when preparing to make an entry using EEPs. Try to get as much information as possible. You can then best decide what methods will work. Ask questions about the type of lock, the key numbers, nearby open windows, a possible extra key held by someone else, the condition of the lock, alarms and other devices attached to the door, and so on. All this information will aid your preparations for the entry. You don t want to damage your customer s property when it isn t necessary. Drilling Pin Tumbler Locks Drill a lock only as a last resort. Two drilling methods can be used with pin tumbler locks. The first method involves drilling of the cylinder plug. This has the advantage of saving the cylinder itself. The inner core can be replaced. This method destroys the lower set of pins just below the shear line, allowing the plug to be turned. Follow these procedures to drill a cylinder plug:
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Copyright 2005 by Bill Phillips. Click here for terms of use.
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1. Drill the plug below the shear line. 2. Insert a key blank and a wire through the drill hole to keep the upper pins above the shear line and the destroyed pins below it. 3. Turn the cylinder core and open the lock. Once the door is open, dismantle the lock; remove and replace the core, and fit new pins to the lock. If you used the plug follower when removing the core, you will only have to fit new lower pins to the lock to match a key. The second method involves drilling just above the shear line into the upper pins. 1. Insert a key blank into the lock to push all the upper pins to the upper pin chambers. 2. Drill about 1 8 inch above the shear line or shoulder of the plug and directly above the top of the keyway (Fig. 17.1). A drilling jig can be useful to ensure that you drill at the proper point on the lock face. Use a 1 8 - or 3 32-inch drill bit. 3. Poke a thin wire or needle into the hole, and withdraw the key to just inside the keyway. Then use the tip of the key to turn the core. Removing the key partway allows the bottom pins to drop below the shear line while the wire or needle keeps the upper pins above the shear line. Once the door is open, dismantle the lock, remove the cylinder, and replace it with a new one. Cylinder Removal Sometimes the cylinder must be removed to open a lock. This means shearing off the screws that hold the cylinder in place. Several different rim cylinder
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Figure 17.1 A drilling jig can help you drill straight. (Desert Publications)
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Figure 17.2 A cylinder removal clamp. (Desert Publications)
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removal tools are available. The one in Fig. 17.2 can be made in your own shop. It s called a cylinder removal clamp. To make one, follow these steps: 1. Use a piece of steel tubing about 1 8 inch larger in diameter than the cylinder. The tubing should be no more than 21 2 inches long. 2. Cut into the tubing about 3 16 inch. 3. Cut a center hole, 1 4 to 1 3 inch in diameter at the end of both cuts, and insert a steel rod about 10 inches long. The rod becomes your handle for turning the cylinder. 4. Drill two holes in the tubing so that you can insert a bolt perpendicular to the handle. Ensure that the bolt will be 1 2 inch in front of the handle. The bolt threads must extend on both sides of the tubing. To remove the cylinder, follow this procedure: 1. After first removing the cylinder rim collar, set the removal clamp over the edge of the cylinder. Tighten down the tension bolt; this provides the gripping pressure on the cylinder. 2. Twist the cylinder clamp by the handles, and force the cylinder to rotate, shearing off the retaining screw ends. 3. Remove the cylinder from the lock. When removed, reach in and open the door by reversing the bolt. You also can use a standard Stillson wrench to remove the cylinder. Cylinders also can be pulled out of the lock unit, but this method ruins the cylinder threads, requiring you to replace the entire unit. The tool used is called a nutcracker. The sharp pincer points are pushed in behind the front of the cylinder face. Clamp down and pull the cylinder out. Many times an unskilled locksmith can ruin the entire lock and a portion of the door by not knowing how to use this tool properly.
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