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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 can indicate that there is a problem with the centre case gearbox. It could be due to an issue with the handle mechanism. A new locking mechanism is usually required to solve these issues. You can do it yourself at a much less cost than a locksmith. Identifying the problem Don't assume your uPVC lock is beyond repair in the event that you've encountered issues wit