Seams to me he has a 1" threaded fork and stem with a quill bolt. It looks like what you did is when you were loosening up the bolt you loosened it all the way...this shouldnt be done because at the end of the quill bolt is a wedge that the bolt threads into...it seems you loosened this too much and the wedge fell down inside your fork. Check there by turning the fork upside down (with it out of the bike obviously) and bang it and shake it a little. if nothing falls out chances are you lost it or its just jammed inside the fork.
It should look something like this...
Your probably missing that little black thing at the very bottom of the quill right? If you really need one you can pick one up for cheap at a bike shop or even off an old bike..you dont need the whole stem, just the quill and wedge. If this doesnt work...e-mail me with your address and I would be happy to send you one that will work.
Last edited by Flatland Freak; 09-19-02 at 09:00 PM.