Replacement Locking Mechanism For UPVC Doors If you hear an "tick tock" sound from your upvc door lock multipoint It could be a sign the gearbox inside the central case is not functioning properly. It could also be due to an issue with the handle mechanism. <img width="499" src="https://www.repairmywindowsanddoors.co.uk/wp-content/uploads/2018/09/Replacement-Windows-150x150.jpg
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