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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 from the backplate of the handle's mounting centres (sometimes called PZ) to the central point of keyhole. The most popular type of uPVC door handle comes with two levers inline one internal and one external that is connected via spindle. They are used to operate the multi-point lock that is found in uPVC as well as aluminiu