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UPVC Door Handles Replacement Guide Once you've got the proper measurements, replacing 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 center of the keyhole. The most commonly used type of uPVC door handle comes with two levers inline, one internal and one external connected by spindles. They operate the multipoint lock that is found on uPVC and aluminium doors, along with some wooden d