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UPVC Door Handles Replacement Guide Replacing door handles made of upvc is a straightforward DIY project when you have the right measurements. These measurements include the distance between the backplate's fixing centres (sometimes called PZ) and the center of the key hole. The most commonly used kind of uPVC door handle comes with two levers inline both internal and external connected by spindles. They are used to operate the multipoint lock on uPVC and aluminium doors, along with some