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How to Install a Double Glazed Door Handle Installing double-glazed door handles isn't a problem when you are willing to put in some effort and possess the appropriate knowledge. It is essential to select the right replacement handle, and note the PZ and 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 specifically designed to be secure, w