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How to Install a Double Glazed Door Handle Double doors with glass handles aren't easy to install, but if you're willing to put in the effort and have a little knowledge it's not difficult. It is crucial to choose the right replacement handle and note the PZ and whether it is sprung or not. uPVC Door Handles There are different types of uPVC door handles that you can pick from, with some better suited to certain doors than others. Some are designed for aesthetic reasons while others are more security