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UPVC Door Handles Replacement Guide Once you have the right measurements, replacing your upvc door handle is a simple DIY project. These measurements include the distance between the backplate of the handle's fixing centres (sometimes called PZ) and the center of the key hole. The most popular uPVC handle has two inline levers. One is internal and the other exterior, linked with a spindle. They are used to operate the multipoint lock that is found on uPVC and aluminium doors, as well as s
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