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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 from the handle's backplate mounting centres (sometimes called PZ) to the centre of keyhole. The most commonly used uPVC handle is made up of two inline levers. One inside and one exterior, linked with spindles. They are used to operate the multipoint lock found on uPVC and aluminium doors, as well as some wooden doors. Bra