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Replacement Locking Mechanism For UPVC Doors If you're experiencing an "tick-tock" sound that is coming from your multipoint door lock made of upvc This could indicate that there are issues within the central case gearbox. It could also be due to by the mechanism for the handle being damaged. To solve these issues, a new lock mechanism might be needed. It is possible to do it yourself for a less cost than a locksmith. Identifying the issue If you've had issues with your uPVC door lock lately, don't assu