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UPVC Door Handles Replacement Guide Once you've got the proper measurements, replacing the 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 centre of keyhole. The most commonly used uPVC handle is made up of two inline levers. One is internal and the other external, joined by a spindle. They are used to operate the multi-point lock that is found in uPVC, aluminium and some wooden doors. Bran