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Replacement Lock For UPVC Door Locks You might want to replace the uPVC locks on your doors to ease of use or necessity. For example, if you have lost your keys or experienced an attack. 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 worth it. Lock Cylinder The lock cylinder is the part of the locking system that allows you to open and close your door. It is comprised of a keyhole and an opening into which you can insert the ke