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Cost to Replace uPVC Door Lock Mechanism Near Me If you have a upvc door it is essential to ensure that the lock functions correctly. are able to gain access to your home if the lock is not working properly. The hinges that are not lubricated are among the many things that can cause a lock to malfunction. A good solution is to lubricate the hinges. You can do this by using a graphite-based grease. Replacement of the cylinder If your door lock doesn't move or you need to move the handle to get it to close