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UPVC Door Handles Replacement Guide Replacing upvc door handles is an easy DIY task once you have the proper measurements. These measurements include the distance between the backplate of the handle's fixing centres (sometimes called PZ) and the centre of the key hole. The most common uPVC handle is made up of two inline levers. One is internal and the other exterior, connected by a spindle. They operate the multipoint lock that is found on uPVC and aluminium doors, as well as some wood