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UPVC Door Handles Replacement Guide Replacing the handles on your doors made of upvc is a simple DIY project once you have the proper measurements. These measurements include the distance between the backplate of the handle's fixing centres (sometimes called PZ) and the center of the key hole. The most popular type of uPVC door handle is one with two levers inline one internal and one external that is connected via spindles. They operate the multi-point lock found in uPVC aluminum, uPVC and a few wooden do