I just received my Tune Mag 180 hubs from Starbike and I am a little puzzled by the freehub. It it dark red and has all of 4 splines on it. It doesn't look like any of my other Campagnolo freehubs. Is the 4 spline hub a Shimano freehub? Did they just send me the wrong item? I tried putting the Campy cassette on the hub, and it doesn't look like it is going to work. Am I doing something wrong?