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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing upvc door handle is a simple DIY project. 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 common type of uPVC door handle has two inline levers one internal and one external, connected by spindles. They operate the multipoint lock found on uPVC and aluminium doors as well as some wooden doors. Brands and Finishes A