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UPVC Door Handles Replacement Guide Replacing upvc door handles is a straightforward DIY project once you have the proper measurements. These measurements include the distance from the backplate's mounting centres (sometimes called PZ) to the center of the keyhole. The most popular kind of uPVC door handle has two inline levers both internal and external, connected by a spindle. They are used to operate the multi-point lock that is found in uPVC aluminum, uPVC and a few wooden doors. Brands Finishes A