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Replacement Locking Mechanism For UPVC Doors If you hear an "tick tock" sound emanating from your upvc door lock multipoint it could be a sign the gearbox in the middle case is malfunctioning. It could be due to a damaged handle mechanism. To address these issues, a replacement locking mechanism could be required. You can make it yourself at a much less cost than a locksmith. Identifying the Issue Don't think your uPVC lock isn't repairable in the event that you've encountered issues with it recently. Y