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How to Install a Double Glazed Door Handle Double glazing door handles can be difficult to install If you're willing to work hard and have a little knowledge it's not that difficult. It is essential to select the right replacement handle and also note the PZ, as well as whether it is sprung or not. uPVC Door Handles There are many different types of uPVC handles that are available, some more suitable for specific doors than others. Some are designed for aesthetic reasons while others are more security-focu