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How to Install a Double Glazed Door Handle Double door handles with glazing aren't easy to install If you're willing to put in the effort and have a little knowledge it's not that difficult. The most important thing is to make sure that you select the right replacement handle and note of the PZ as well as whether or not it's spring-loaded. uPVC Door Handles There are many different types of uPVC handles that are available with some that are more suitable for specific doors than others. Some are specifically d