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Cost to Replace uPVC Door Lock Mechanism Near Me If you have a door made of pvc it is crucial to keep the lock functioning properly. In the event that it fails, criminals can gain entry to your home in seconds. There are a variety of reasons that can cause a lock to malfunction, including unlubricated hinges. A good solution is to grease the hinges. This can be done by using a lubricant based on graphite. Repair of the cylinder If your door lock doesn't open or close, or you have to jiggle the handle in