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Replacement Locking Mechanism For UPVC Doors If you hear an "tick tock" sound emanating from your door lock made of upvc multipoint, it could be an indication that the gearbox in the centre case is failing. It could also be the result of by the mechanism for the handle being damaged. To address these issues, a new locking mechanism could be required. It is possible to do it yourself for a less cost than an expert locksmith. Identifying the Issue If you've had issues with your uPVC door lock recently, don't