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Replacement Locking Mechanism For UPVC Doors If you're experiencing a "tick-tock" noise that comes from your multipoint door lock made of upvc This could indicate that there are issues within the gearbox in the centre of the case. It can also be caused by an issue with the handle mechanism. A new lock mechanism is usually needed to resolve these problems. You can do it yourself and at a lower cost than the services of a locksmith. Identifying the Issue If you've experienced issues with your uPVC door lock