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How to Replace a UPVC Door Lock If you've recently moved to a brand new home or suffered a burglary at your property, changing the locks on your doors is a crucial step to regain security. But the process isn't quite as daunting as it might seem. All you need is a little preparation and the right tools, and a locksmith's visit will be avoided. Identifying the problem It is important to recognize the signs that you can tell if a uPVC door lock is going wrong. If you have trouble turning the handle or you h