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How to Install a Double Glazed Door Handle Double glazing door handles can be difficult to install however if you're willing to put in the effort and are armed with a bit of knowledge, it's not that difficult. It's important to choose the right replacement handle, and also note the PZ, as well as whether it's spring-loaded or not. uPVC Door Handles There are various kinds of uPVC door handles that you can pick from, and some are better suited for certain doors than others. Some are designed for aesthetic r