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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing upvc door handles is a straightforward DIY project. These measurements include the distance from the backplate's mounting centres (sometimes called PZ) to the centre of keyhole. The most common type of uPVC door handle comes with two inline levers one internal and one external, connected by spindles. They are used to operate the multi-point lock that is found in uPVC aluminum, uPVC and a few wooden doors.
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