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UPVC Door Handles Replacement Guide Replacing the handles on your doors made of upvc is an easy DIY task once you have the proper measurements. These measurements include the distance between the handle's backplate fixing centres (sometimes referred to as PZ) and the center of the key hole. The most commonly used type of uPVC door handle is one with two inline levers one internal and one external that is connected via spindles. They are used to operate the multipoint lock that is found on uPVC and alumi