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UPVC Door Handles Replacement Guide Once you've got the proper measurements, replacing your upvc door handles is a straightforward DIY project. These measurements include the distance from the backplate of the handle's mounting centres (sometimes called PZ) to the central point of keyhole. The most popular kind of uPVC door handle comes with two inline levers, one internal and one external that is connected via spindles. They operate the multipoint lock on uPVC and aluminium doors as well as some wooden one