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Lock Replacement uPVC Door Tips There are many ways and solutions to your problems, whether you're dealing locked locks that are stuck or a multi-point system that is unstable. These easy tips can save you money on expensive repairs. They vary from jiggling stuck keys to adjusting misaligned door. Stuck locks are often caused by dust and dirt that build up inside the mechanism. Regularly cleaning and lubricating your locks will keep them running smoothly. Damaged gearboxes uPVC door locks are exposed to