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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing upvc door handles is a simple DIY project. These measurements include the distance between the backplate of the handle's fixing centres (sometimes referred to as PZ) and the center of the key hole. The most common uPVC handle is two inline levers. One is internal and the other external, joined with a spindle. They are used to operate the multi-point lock which is used in uPVC aluminum, uPVC and