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UPVC Door Handles Replacement Guide Once you have the correct measurements, replacing the upvc door handles is a simple DIY project. These measurements include the distance between the backplate's fixing centres (sometimes referred to as PZ) and the center of the key hole. The most commonly used kind of uPVC door handle has two inline levers one internal and one external connected by spindle. They operate the multi-point lock found in uPVC as well as aluminium and wooden doors. Brands finishes A br