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As you lift the pin stack with torque applied, eventually its cut will reach the shear line, allowing the plug to turn; the top pin will then be completely trapped in the shell, while the bottom pin stays in the plug, what is billiards no longer held down by spring pressure. Master ring cylinders (which are no longer in common commercial production but were once marketed by Corbin) use this mechanism to provide independently-keyed master keying. Better quality locks are less forgiving of too much torque. Learn to apply the minimum amount of torque needed to turn the plug. See Figure 5. With the tool in the keyway, apply torque and try to turn the plug. Figure 5. Applying torque. Take note of the direction the keys turn on doors you use to help develop an inituition about which direction to apply torque. It's binding because it's the one most out of alignment in the direction you're turning, and so its top pin is being pinched (gently) between the plug and the shell. If pushed up, it eventually sets and the plug turns slightly (and the pin stack's state changes to set/not-binding).

First, apply light torque (as you practiced in the previous exercises) to the two pin cylinder and gently feel each pin. Spend more time on this exercise than you think you need to; most people never learn to properly apply the light touch needed to pick better quality locks. Develop a light touch. Keep practicing with the two pin lock, trying to lighten your touch as you do, and making sure you consistently can pick the pins one at a time. Now, while continuing to apply torque, insert your pick and find and slowly lift the pin stack. The resistant pin stack is the called the binding pin. A year after opening the Kinderplex, Google established a second program called the Woods. Google claims that many of their products in Google Labs started out as pet projects in the 20 percent time program. From 2001 to 2004, Dave worked at PayPal (acquired by eBay in 2002) as Director of Marketing, where he founded and ran the PayPal Developer Network program. Reset the lock by returning the plug to the vertical locked position and try again but with torque applied in the other direction.

When you've mastered the SX locks, try the "Schlage SC" keyway locks. These skills become very important when picking better quality locks, so take your time here. Now release torque and try again, but this time lift the pins as little as you can when you test them, while still distinguishing between the two states. If you release pressure with your pick while still applying torque, the bottom pin will drop freely, and will not have any spring pressure if you try to push it back up. Finally, for a real challenge, try the Yale "Y1" keyway locks. Several positions are possible; here a vertically-oriented torque tool is used at the top of the keyway. It is usually possible to insert the torque tool at either the top or bottom part of the keyway. Apply some torque to the plug and feel the two pin stacks with your pick. When you reach the shear line, the plug will turn. It feels much as it does when binding and unset, but will not set (since a binding pin can only move up, not down). It feels "squishy," with more resistance than from just the spring.

But the men and women who hold these government offices most likely could earn even more in a private sector job. The hotel was advertised as comfy accommodations for young women visiting the 1893 World's Fair in Chicago, but in fact it included hidden staircases and trap doors that allowed Holmes to sneak into those women's rooms. It won't turn, of course, because the cut of the (single) pin stack is still below the shear line and its top pin is preventing the plug from rotating. When the plug turned slightly, it trapped the top pin above the shear line, preventing it from re-entering the plug. While this might have gotten the lock open, you just as easily might have pushed the cut past the shear line entirely, preventing the lock from opening altogether. Overset/binding. The cut in the pin stack is past the shear line. Set/not-binding. The pin stack was already picked. While pins are usually set by raising the cut from the plug to the shear line, they can also be picked by first oversetting the cut to within the shell and then lowering it to the shear line. Eventually, you'll reach a point where the plug will turn ever so slightly and the pin will not go up any farther.