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Replacement Locking Mechanism For UPVC Doors If you're experiencing a "tick-tock" sound that is coming from your upvc multipoint door lock This could indicate that there is an issue with the central case gearbox. It could also be the result of by the handle mechanism being damaged. To solve these issues, a new lock mechanism might be needed. You can make it yourself at a much lower cost than the services of a locksmith. Identifying the Problem If you've experienced issues with your uPVC door lock in the