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Lock Replacement uPVC Door Tips There are many ways and solutions to your problems whether you're facing an unresponsive lock or a multi-point system that is erratic. These simple tips can help you save money on costly repairs. They range from jiggling stuck key to adjusting a misaligned door. Dust and dirt can build up inside the mechanism, which can cause it to get stuck. Regularly cleaning and lubricating your locks will ensure that they are running effortlessly. Gearboxes that are damaged uPVC locks