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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 handle's backplate mounting centres (sometimes called PZ) to the central point of keyhole. The most common uPVC handle is made up of two inline levers. One inside and one external, joined with spindles. They are used to operate the multipoint lock found on uPVC and aluminium doors and also on some wooden ones. Brands and Finishes A