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How to Install a Double Glazed Door Handle Installing double glazing door handles isn't difficult when you are willing to put in a bit of effort and have the necessary information. The most important thing is to make sure you choose the correct replacement handle and take note of the PZ and whether or not it's sprung. uPVC Door Handles There are many varieties of uPVC handles available with some that are more suitable for certain doors than others. Some are designed to be more security focused whilst other