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UPVC Door Handles Replacement Guide Replacing upvc door handles is an easy DIY task 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 common kind of uPVC door handle comes with two levers inline one internal and one external connected by a spindle. They operate the multi-point lock which is used in uPVC aluminum, uPVC and a few wooden doors. Brands Finishes A