Hey Guys!

I just bought a 97 Klein Quantum Race, and while assembling it, I noticed that there was no expander wedgie thingy on the end of the stem- it looked like this:


Well, I've never seen a quill stem without an expander, but i don't have experience with bikes- so I inserted the stem into the headset and tightened the bolt- and VIOLA[sic]- it threaded into something.

What am I missing [as in not understanding] here? Is the expander merely already down in the headset, and...no...wait- this stem isn't even shaped like the other quill stems I've seen before, on the bottom end- maybe this is some kind of different system? I don't know- edumacate me!

What do I have here? (If you could provide a diagram as to what's inside the headset, instead of the usual expander bolt, it'd be helpful)

Anyone?