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UPVC Door Handles Replacement Guide Once you've got the proper measurements, replacing the upvc door handle is a simple DIY project. These measurements include the distance from the handle's backplate mounting centres (sometimes called PZ) to the center of the keyhole. The most popular uPVC handle is two inline levers. One inside and one exterior, connected by a spindle. They operate the multipoint lock that is found on uPVC and aluminium doors along with some wooden ones. Brands Finishes A broken uPV