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Replacement Locking Mechanism For UPVC Doors If you hear an "tick tock" sound from your upvc door lock multipoint it could be a sign that the gearbox in the centre case is not functioning properly. It could also be caused by a damaged handle mechanism. To solve these issues, a new locking mechanism could be required. Here is how to do it yourself for much less than the cost of locksmith. Identifying the issue Don't believe that your uPVC lock is beyond repair if you've had problems with it in the past. Depe