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Replacement Locking Mechanism For UPVC Doors If you hear a "tick tock" sound coming from your door lock made of upvc multipoint, it could be an indication that the gearbox inside the central case is malfunctioning. It could also be due to by the mechanism for the handle being damaged. A new lock mechanism is usually required to fix these issues. Here is how to do it yourself for less than the cost of locksmith. Identifying the issue If you've had issues with your uPVC door lock lately do not assume it is b