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UPVC Door Handles Replacement Guide Replacing upvc door handles is a simple DIY project once you have the proper measurements. These measurements include the distance between the backplate's fixing centres (sometimes called PZ) and the centre of the key hole. The most commonly used uPVC handle has two inline levers. One is internal and the other external, joined by a spindle. They operate the multi-point lock which is used in uPVC as well
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