The player must first pocket a red ball and then try to pocket any colour he may choose, scoring the value of the ball that he has pocketed. The player can win a frame by scoring the most points by pocketing the red and colored balls with the cue ball. Chalk in small cubes is applied uniformly to the cue tip permitting the players to strike the cue ball off centre on purpose in order to impart a spinning motion, called "side" in Great Britain and "English" in the United States. You'll only need a great big box and some howling kids to play. This technique requires a great deal of practice to master, but has the surprising property of sometimes being more effective against better made locks. Tubular locks suffer from the same manufacturing imperfections as other locks and so can be picked with essentially the same techniques. These locks must be picked at both the top and the bottom, sometimes alternating between them. In a lock with six pin stacks with a uniform chance of a pin setting at either shear line, the probability of a picked lock actually opening is only 1/64. Picking techniques for these locks involve the use of special torque tools designed to put torque on only one of the two concentric plugs.

Not all locks use a physical key. Many dimple key locks also incorporate secondary high security locking mechanisms. These are typically pin tumbler locks, but their orientation is "upside down" with respect to the convention for locks installed in the United States. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. However, because they jam when false set, locks with serrated pins tend to impression very well (impressioning is a decoding technique that produces a working key based on marks left on a progressively cut key blank). While many of the principles of pin tumbler lock picking apply or can be adapted to other mechanical lock designs, what is billiards a complete discussion of these locks and techniques for defeating them is beyond the scope of this document. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. Many inexpensive locks are grossly misaligned, making them quite forgiving of chaotic picking technique. Note that although heavy torque is required, this technique also demands high sensitivity and control. It’s as if you were a flute and the breath is making a note through you.

You wouldn’t know what note you’d heard before. Again we know everything: the starting conditions are known completely, the box is completely understood &c &c. These locks are unusual in not requiring springs on the individual tumblers and are therefore especially well suited to outdoor use under extreme conditions. Schlage Primus locks also use a sidebar. The sidebar must engage these grooves in order to retract and allow plug rotation. Many of these mechanisms involve the use of a "sidebar" that must retract before the plug can rotate. A variety of schemes are used to key the sidebar. Some high security locks, such as those manufactured by Abloy and Abus, use round disk tumblers that are rotated into position by a specially designed key bitted with angled cuts corresponding to each tumbler. Other lock types include "European profile" cylinders, master keyed locks, master ring and SFIC cylinders, tubular pin tumbler locks, dimple-key pin tumbler locks, pin tumbler locks with secondary locking mechanisms, wafer tumbler locks, disk tumbler locks, lever tumbler locks, combination locks, and electronic locks. Most automotive locks use wafer tumblers. Use the kids' costumes to inspire the movie script, or you can provide garb by hauling out some old clothes, shoes, and costumes and letting the kids deck themselves out in whatever outfit suits their spooky style.

As with pin tumbler locks, because the levers, gates, and fence are slightly out of alignment, it is usually possible to raise and pick the levers one at time. Gradually ease up on the torque, allowing pins to drop one at a time. The two shear lines are keyed independently by a "double height" pin stack, with one set of cuts keyed to each. In fact, master keyed pin stacks are easier to pick than those that are single-keyed; there are two chances to lift a cut to the shear line. Most pin tumbler cylinders can be "master keyed" to allow more than one key bitting to operate it. 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. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. Instead, they use flat "wafers," typically extending across the full height of the plug. Give each kid a cup full of candy; each cup of candy should be a different color or type. Player B cannot see the ball rolling, but player A can shout directions (move left, move right) to their partner in order to move the cup in the ball's path.