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UPVC Door Handles Replacement Guide Replacing the handles on your doors made of upvc is an easy DIY task once you have the correct 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 type of uPVC door handle comes with two inline levers, one internal and one external connected by spindle. They operate the multipoint lock on uPVC and aluminium doors, and also on some wooden ones. Brands and Fin