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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 can indicate that there is an issue with the central case gearbox. It could be due to an issue with the handle mechanism. A new locking mechanism is often required to fix these issues. You can make it yourself and at a lower cost than an expert locksmith. Identifying the Problem Don't assume your uPVC lock isn't repairable if you've had problems with it