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.If a spacer falls into the keyway completely, the only option is to remove it.Ahook shaped piece of spring steel works well for this, though a bent paperclip will work justas well unless the spacer becomes wedged.9.12 Vibration PickingVibration picking works by creating a large gap between the key and driver pins.Theunderlying principle is familiar to anyone who has played pool.When the queue ball strikesanother ball squarely, the queue ball stops and the other ball heads o with the same speedand direction as the queue ball.Now imagine a device that kicks the tips of all the key pins.The key pins would transfer their momentum to the driver pins which would y up into thehull.If you are applying a light torque when this happens, the plug will rotate when all the39drivers are above the sheer line.9.13 Disk TumblersThe inexpensive locks found on desks use metal disks instead of pins.Figure 9.10 shows thebasic workings of these locks.The disks have the same outline but di er in the placementof the rectangular cut.These locks are easy to pick with the right tools.Because the disks are placed closetogether a half-round pick works better than a half-diamond pick (see Figure A.1).You mayalso need a torque wrench with a narrower head.Use moderate to heavy torque.40Figure 9.10: Workings of a disk tumbler lock41Chapter 10Final RemarksLock picking is a craft, not a science.This document presents the knowledge and skills thatare essential to lock picking, but more importantly it provides you with models and exercisesthat will help you study locks on your own.To excel at lock picking, you must practice anddevelop a style which ts you personally.Remember that the best technique is the one thatworks best for you.42Appendix AToolsThis appendix describes the design and construction of lock picking tools.A.1 Pick ShapesPicks come in several shapes and sizes.Figure A.1 shows the most common shapes.Thehandle and tang of a pick are the same for all picks.The handle must be comfortable andthe tang must be thin enough to avoid bumping pins unnecessarily.If the tang is too thin,then it will act like a spring and you will loose the feel of the tip interacting with the pins.The shape of the tip determines how easily the pick passes over the pins and what kind offeedback you get from each pin.The design ofa tip is a compromise between ease ofinsertion, ease ofwithdrawal and feelof the interaction.The half diamond tip with shallow angles is easy to insert and remove,so you can apply pressure when the pick is moving in either direction.It can quickly pick alock that has little variation in the lengths of the key pins.If the lock requires a key thathas a deep cut between two shallow cuts, the pick may not be able to push the middle pindown far enough.The half diamond pick with steep angles could deal with such a lock, andin general steep angles give you better feedback about the pins.Unfortunately, the steepangles make it harder to move the pick in the lock.A tip that has a shallow front angle anda steep back angle works well for Yale locks.The half round tip works well in disk tumbler locks.See section 9.13.The full diamondand full round tips are useful for locks that have pins at the top and bottom of the keyway.The rake tip is designed for picking pins one by one.It can also be used to rake overthe pins, but the pressure can only be applied as the pick is withdrawn.The rake tip allowsyou to carefully feel each pin and apply varying amounts ofpressure.Some rake tips are ator dented on the top to makes it easier to align the pick on the pin.The primary bene tof picking pins one at a time is that you avoid scratching the pins.Scrubbing scratches thetips of the pins and the keyway, and it spreads metal dust throughout the lock.If you wantto avoid leaving traces, you must avoid scrubbing.The snake tip can be used for scrubbing or picking.When scrubbing, the multiple bumps43generate more action than a regular pick.The snake tip is particularly good at opening vepin household locks.When a snake tip is used for picking, it can set two or three pins atonce.Basically, the snake pick acts like a segment of a key which can be adjusted by liftingand lowering the tip, by tilting it back and forth, and by using either to top or bottom ofthe tip.You should use moderate to heavy torque with a snake pick to allow several pins tobind at the same time.This style of picking is faster than using a rake and it leaves as littleevidence.A [ Pobierz całość w formacie PDF ]