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Replacement Locking Mechanism For UPVC Doors If you hear a "tick tock" sound from your door lock made of upvc multipoint, it could be a sign the gearbox in the centre case is malfunctioning. It can also be caused by an issue with the handle mechanism. To address these issues, a replacement locking mechanism may be required. You can make it yourself for a less cost than the services of a locksmith. Identifying the issue If you've experienced issues with your uPVC door lock recently do not assume it's beyond