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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 are armed with a bit of knowledge, it's not that difficult. It is crucial to choose the right replacement handle and take note of the PZ and whether it's sprung or not. uPVC Door Handles There are a variety of uPVC handles to choose from, some more suitable for specific doors than others. Some are designed for aesthetic reasons, while others are more focused on securi