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Replacement Lock For UPVC Door Locks You may want to replace the uPVC locks on your doors to ease of use or a need. For example in the event that you've lost your keys or have experienced a break-in. It may cost a little to get a locksmith on the job, but the peace of mind that is provided by a professional installation is well worth it. Lock Cylinder The lock cylinder is component of the locking mechanism that permits you to open or shut your door. It is comprised of a keyhole as well as a slot