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UPVC Door Handles Replacement Guide Once you have the right 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 centre of keyhole. The most popular uPVC handle is made up of two inline levers. One is internal and the other exterior, connected by spindles. They operate the multipoint lock that is found on uPVC and aluminium doors along with some wooden doors. Brands