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How to Install a Double Glazed Door Handle Double glazing door handles can be tricky to install, but if you're willing to work hard and have a basic understanding of the subject, it's not too hard. The key is to ensure you pick the correct replacement handle and take note of the PZ as well as whether or not it's spring-loaded. There are many different types of uPVC handles to choose from, some more suitable for specific doors than others. Some are specifically designed to be secure, while others a