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UPVC Door Locks Replacement If your uPVC doors aren't locking correctly, or if the key keeps turning inside the lock, you might need to replace the door locks with uPVC. Follow the instructions of the manufacturer and then secure the replacement multipoint locking mechanism to the uPVC panel prior to beginning the repair. Identifying the Problem Upvc door locks are renowned for their strength and security, but they can be susceptible to problems as time passes. These problems could range from minor an