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UPVC Door Handles Replacement Guide Replacing the handles on your doors made of upvc is a straightforward DIY project once you have the correct measurements. These measurements include the distance between the handle's backplate fixing centres (sometimes called PZ) and the centre of the key hole. The most popular kind of uPVC door handle has two inline levers, one internal and one external that is connected via a spindle. They are used to operate the multipoint lock found on uPVC and aluminium doors,