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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 in the event that you've lost your keys or suffered an attack. Engaging a locksmith to carry out this work will cost you a bit but it's worth the security and peace of mind that a professional install brings. Lock Cylinder The lock cylinder is a part of the locking mechanism that permits you to open or shut your door. It consists of a keyhole and an opening in which you can