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How to Replace a UPVC Door Lock If you've recently moved into a brand new home or suffered a burglary, changing your door locks is a crucial step to returning security. But the process isn't quite as intimidating as it appears. It only takes a little preparation and the right tools to avoid a visit from a locksmith. Identifying the Issue It is crucial to identify the signs of a uPVC lock that is not working properly. If you are having trouble turning the handle or you hear strange noises when you operate