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UPVC Door Handles Replacement Guide Once you have the correct 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 uPVC handle is two inline levers. One internal and one exterior, linked via a spindle. They are used to operate the multipoint lock on uPVC and aluminium doors, along with some wooden doors. Brands and finishes A broken