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Replacing a UPVC Door Lock Your uPVC door locks are an essential part of your security system. Keep them in good condition with a little regular maintenance. To keep your lock mechanisms running smoothly and functioning, make use of a graphite-based oil. Different kinds of uPVC locks come with different levels of security. Select the right lock for your needs. How to replace a lock on a door It's vital to maintain the door lock in good working condition. Before you begin the replacement process, there ar