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Lock Replacement uPVC Door Tips There are many ways and solutions to your problems regardless of whether you're dealing with an unresponsive lock or a multi-point door system that is erratic. These simple tips can save you cash on costly repairs. They vary from jiggling stuck keys to adjusting the misaligned of your door. Locks that are stuck are usually caused by dust and dirt that can build up within the mechanism. Regular cleaning and lubrication can ensure that your locks are operating well. Gearboxes