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