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Choosing the Right UPVC Door Handle Replacement Replacing the handles on your doors made of upvc is an easy task but selecting the correct handle can be tricky. Most modern double glazed handles include spring cassettes within them but older ones don't. If the handle of your upvc is loose and floppy, there could be a problem with the internal components of the multipoint lock. This article will address the various possible issues their causes. Handles that sag or droop