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Repair My Windows And Doors Over time, locks will wear out. Often jamming a key inside a lock, or simply locking and unlocking it over and over can damage the hardware. Rekeying your locks could solve this issue, however replacing your lock is a far better solution. New locks are hard to turn and also have a new design that lets honest people in while keeping those who are dishonest out. Deadbolts A deadbolt is the best method to guard your door. These locks are harder to penetrate than a lever or doorknob lock due to an extra-strong bolt that is set deeper into the door frame. It is essential to check the condition of your door deadbolt frequently and replace it if it shows signs wear. A deadbolt could be a keyed lock that is opened with keys on one side and an open thumb turn on the other or a double-cylinder lock which requires homeowners to use keys on both sides of the door to open it. The type of lock you select will depend on the degree of security you require for your home, and a locksmith can help you determine which type of deadbolt is best suited to your requirements. If you're planning to install a new deadbolt yourself start by getting rid of the old bolt as well as its hardware. You can use a screwdriver to loosen the two screws on the inside face of the bolt, then remove the set plate that secures the bolt and binds it to the door frame. You'll need to remove the bolt and strike plate from the outside of the doors. Install the new deadbolt next by inserting it with the latch facing upwards into the strike plate. Then, you'll have to reattach the bolt to the strike plate and secure it with short woodscrews. You should always check the instructions for installation that was included with the deadbolt you purchased to ensure that you're following the instructions correctly. If you're not sure what to do, speak with an expert at your local hardware store and let them know what measurements you've taken on your door. They'll be able to guide you and show you models that can work with your existing hardware. If you're using a lock that has an ANSI rating then look for one that is grade two or more. This means that the bolt has met industry standards for durability and strength. Deadlocks The deadlock situation is one that causes processes to not be able to proceed with their work because each process has locked a resource that another process also needs. This results in a cycle of waiting in which the processes are not able to be completed (Mutual exclusion). To avoid this problem the operating system must have a way to detect deadlocks. In addition, it must be able to solve deadlocks if they occur. To avoid deadlocks, it's common to allocate all resources to a single category. A system could, for example, divide resources into categories such as memory, printers, and CPUs. This lets all processes access the same resources, without causing deadlocks. This technique can be combined with a basic Banker's algorithm to detect deadlocks. This method examines the status of each process and, if it's not completed its task, the process is deemed to be in a state of deadlock. However this method isn't foolproof. A programmer can still design a deadlock which the operating system would not detect. Another method for preventing deadlocks is to require that all processes hold and release their own resources before requesting new ones. This allows the operating system to stall requests for processing and free existing resources. This prevents starvation of resources but it does have some drawbacks, such as late process inception and frequent preemptions. A third method is to use a deadlock detection system that uses a queue to keep track of the status of each process and its children. This kind of mechanism is helpful in identifying deadlocks that aren't detected by a simple test. However, it can only be effective when the operating system is designed to support this kind of fix. Other methods to avoid deadlocks involves using a priority queue, where each process is assigned a numerical priority. The higher priority of a process, the more likely it is to be the victim of a rollback. This technique can reduce deadlocks, but can also result in low priority processes being delayed indefinitely. This is the reason why it's not recommended for applications that have high priority. Mul-T-Locks Mul-T-Lock deadbolts and cylinders are designed to be more secure than conventional locks. They are constructed with durable materials and the latest technology to resist to attempts to pick, bump or drilling. So you can rest soundly knowing that your home or business is protected. It takes time and effort to overcome these locking systems. It's not impossible. Older models of Mul-T-Lock, for example, had serious problems in lock-picking techniques. They were described in videos as easily picked. The newest version is resistant to these techniques, and has been tested by experts. The primary factor in this level of security is the inside pin stacks. They are laid out in dimpled layers within the outer pin stacks of driver pins. These dimples have small islands in their center that control the lift of the pin stacks in the inner layers, allowing them reach the shearline. Once there, they press against the inner key-pin of the binding to create the lock. The outer drivers will then be removed from the plug and the lock is open. This system also provides protection against pulling attacks. This is achieved by incorporating an interior shear line which makes it harder to ram the cylinder with an external tool. The cylinder also has a shear line at the bottom and top to protect it. This is in addition to the side and back pins, which provide additional drill, pick and pry resistance. Another way that this system gives extra security is by making it extremely difficult to copy. This is achieved by requiring an official Mul-T-Lock key card and permitting only authorized locksmiths to make copies. It is highly unlikely that anyone would attempt to copy a Mul-Tlock key from a photo, since it is not permitted without a valid card. Mul-T-Lock is an international company that, specializes in high-security locking solutions. They have been in the business of developing, manufacturing and marketing cylinders for more than five decades and are known all over the world for their innovation and quality. They are compliant with a variety of global standards including UL CEN VOS and SKG. Mortise Locks A mortise is a rectangular box-shaped device that fits into the cutout on the outside of a front door. They are extremely popular in Europe and are available in a vast range of designs that can be fitted to doors of all styles. They can be flush with the exterior face or recessed into the edge. They can be operated using the key or handle from the outside. When replacing or installing mortise locks, make sure to read the instructions included with the hardware. Many mortise locks manufacturers have websites that provide instructions for installation and maintenance, as well as part lists. It is a good thing to check these sites prior to starting any repair or replacement work. Before starting the project, it is a good practice to measure the existing mortise pockets on the door. Download or purchase a template to ensure that the correct size is cut. If the pocket is too large, the lock will not fit correctly and will be difficult to operate. It is also a good idea to mark the center of the hole to mark the face and edge of the door on the template with pencil. This will stop splintering during drilling. Once the pocket is properly sized and the pocket is properly sized, a mortise lock can be inserted into it and bolted in place. The spindle can be screwed in place with the new handle or knob. The cylinder which controls the locking and unlocking functions of the lockcase can be keyed to match the existing keys. This allows you to utilize a single key for all doors within your home. In residential settings mortise locks are commonly used on exterior doors that open onto the street or a porch or patio area. These locks are also common in apartment buildings and large commercial complexes. In both cases, it is important to remain vigilant about security and not become complacent, as burglars do seek out easy ways to enter homes and businesses via doors that are not secure.