I ride a 1983 Eddy Merckx track bike as my around campus machine, and I noticed that at least for the last two weeks, the steering has been a bit odd. It turns freely, except when it is at, or close to center (ie you would be riding in a straight line). At that point, there is almost a spring loaded centering feel, that snaps the steering to center. I haven't worked much with threaded headsets, or with track bikes in general, so perhaps this is a result of the design of the bike. I haven't had it long, and I don't really recall if it was like this since I got it or not. I thought the headset might be too tight, so I loosened that a bit, but to no avail. Any ideas?