Zipp Track Disc Axle Conversion Kit - Anyone ever use one?

preeby
preeby Posts: 22
edited July 2009 in Track
Hi all,

Wondering if anyone has successfully used one of these kits to convert a road disc for track use? Looking at the photo, I cannot see how the sprocket is attached to the wheel. Am I missing something, perhaps the photo is not complete..? Appreciate if someone could clarify this for me before I take the plunge...

track-axle-conversion-kit.jpg
Do you know the five lamps ?