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How to Install a Double Glazed Door Handle Double doors with glass handles can be difficult to install, but if you're willing to put in the effort and have a basic understanding of the subject, it's not difficult. The most important thing is to make sure 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 many varieties of uPVC handles available with some that are more suitable for certain doors than others. So