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Replacement Lock For UPVC Door Locks You may want to replace the uPVC locks on your doors due to convenience or a need. For instance in the event that you've lost your keys or suffered a break-in. Engaging a locksmith to carry this task isn't cheap, but it can be worth the security and peace of mind that a professional installation brings. Lock Cylinder The lock cylinder is component of the locking mechanism that permits you to open or close your door. It comes with a keyhole and a slot in which you insert