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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 from the backplate's mounting centres (sometimes called PZ) to the centre of keyhole. The most popular type of uPVC door handle is one with two levers inline one internal and one external connected by spindle. They operate the multi-point lock which is used in uPVC as well as aluminium and wooden doors. Brands Finishes A damaged uPVC h