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Replacement Locking Mechanism For UPVC Doors If you hear an "tick tock" sound coming from your door lock made of upvc multipoint It could be a sign that the gearbox in the centre case is failing. It could also be the result of by the mechanism for the handle being damaged. To resolve these issues, a replacement locking mechanism could be required. You can do it yourself for a lower cost than the services of a locksmith. Identifying the issue If you've experienced issues with your uPVC door lock in the past,