Trerank

Hello all, I have a question about the mudshield FTC4940 as shown in dailysleaze photo. Is this mudshield pressed on using the outer rim or inner rim? I have one of these mudshields which came in a flange kit. The bottom inner (indented piece) of the mudshield touches the flange middle cylinder. I can not see how the mudshield can be pushed onto the flanges raised surface.