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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 is a problem with the centre case gearbox. It could also be due to an issue with the handle mechanism. To address these issues, a new locking mechanism may be required. You can make it yourself for a less cost than a locksmith. Identifying the issue If you've been having trouble with your uPVC door lock recently do not assume