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Replacement Locking Mechanism For UPVC Doors If you're hearing a "tick-tock" noise that comes from your multipoint door lock made of upvc This could indicate that there is a problem with the central case gearbox. This can also be caused by the handle mechanism being damaged. A new lock mechanism is usually required to solve these issues. Here is how to make it yourself for less than the cost of a locksmith. Identifying the Issue If you've experienced issues with your uPVC door lock lately do not assume it