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Replacement Lock For UPVC Door Locks You may need to replace your uPVC door locks for necessity or convenience like after a burglary or the loss of your keys. Engaging a locksmith to carry this task will cost you a bit but it's worth the peace of mind and security that a professional installation brings. Lock Cylinder The lock cylinder is a part of the locking mechanism that permits you to open or close your door. It is comprised of a keyhole as well as an opening in which you insert your key. The cyl