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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing your upvc door handles is a simple DIY project. These measurements include the distance from the backplate's mounting centres (sometimes called PZ) to the centre of keyhole. The most common type of uPVC door handle is one with two levers inline one internal and one external that is connected via spindle. They are used to operate the multipoint lock that is found on uPVC and aluminium doors as well as some w