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UPVC Door Handles Replacement Guide Replacing door handles made of upvc is a simple DIY project once you have the proper measurements. These measurements include the distance between the backplate's fixing centres (sometimes referred to as PZ) and the centre of the key hole. The most popular uPVC handle has two inline levers. One inside and one exterior, linked with spindles. They are used to operate the multipoint lock on uPVC and aluminium doors, as well as some wooden doors. Brands and finishes A broken