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UPVC Door Handles Replacement Guide Replacing upvc door handles is a simple DIY project when you have the right measurements. These measurements include the distance between the handle's backplate fixing centres (sometimes called PZ) and the center of the key hole. The most popular uPVC handle is made up of two inline levers. One is internal and the other external, joined with a spindle. They are used to operate the multi-point lock that is found in uPVC aluminum, uPVC and a few wooden doors. Brands fi