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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 that the gearbox in the middle case is not functioning properly. It can also be caused by a damaged handle mechanism. A new lock mechanism is often required to resolve these problems. It is possible to do it yourself and at a lower cost than a locksmith. Identifying the problem If you've been having trouble with your uPVC door lock in the past don't think i