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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing upvc door handles is a simple DIY project. These measurements include the distance from the backplate of the handle's mounting centres (sometimes called PZ) to the centre of keyhole. The most popular type of uPVC door handle has two inline levers both internal and external, connected by a spindle. They are used to operate the multipoint lock on uPVC and aluminium doors along with some wooden ones. Brands and Finishes A broke