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Choosing the Right UPVC Door Handle Replacement It's simple to replace your handles made of upvc however, choosing the correct handle can be a challenge. Most modern double glazed handles have spring cassettes built into them, however older models don't have. If your upvc handle seems loose and floppy, there could be an issue with the internal parts of the multipoint lock. This article will cover the various possible issues and their causes. Handles that sag or loosen UPVC handles are prone to wear