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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 put in the effort and have a little knowledge it's not that difficult. It's important to ensure you choose the correct replacement handle, and keep track of the PZ and whether or not it's spring-loaded. uPVC Door Handles There are various kinds of uPVC door handles to choose from, with some being better suited to certain doors than others. Some are specifically designed for aesthetic purpos