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