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UPVC Door Handles Replacement Guide Once you have the correct measurements, replacing the upvc door handle 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 uPVC handle is made up of two inline levers. One is internal and the other external, joined via a spindle. They operate the multi-point lock which is used in uPVC aluminum, uPVC and a few wooden doors. Brands and Finishes A damaged uPV