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How to Install a Double Glazed Door Handle Double door handles with glazing can be tricky to install however if you're willing to work hard and have a little knowledge it's not too hard. It is crucial to choose the correct replacement handle and also note the PZ as well as whether it's spring-loaded or not. uPVC Door Handles There are a variety of uPVC handles that are available, some more suitable for certain doors than others. Some are primarily designed for aesthetic reasons while others are more securi