On my bike, I have a very old Ofmega headset (1982) that is very used. I tightend it up to the point where there is no play, but smooth enough to be acceptable. I also completely overhauled it. However... around and hour later... the headset has play in it again. The lock nut is very tight, and stayed tight, but it still feels like the headset loosend up.
I am dumbfounded. What could this mean? Could it be pitted? I looked for signs but found none.