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How to Install a Double Glazed Door Handle Double door handles with glazing can be tricky to install, but if you're willing to put in the effort and have a basic understanding of the subject, it's not difficult. The key is to ensure you pick the correct replacement handle and take note of the PZ and whether or not it's sprung. uPVC Door Handles There are a variety of uPVC door handles to pick from, and some are better suited for certain doors than others. Some are primarily designed for aesthetic purposes