Originally Posted by
hueyhoolihan
well, if you had a good hold on the top cup flats and cranked down hard on the locknut and you still are having problems, i suppose a little locktite couldn't hurt. i wish you well.
+1. I'm a little late in getting back to this thread, but I'd had a similar problem with my '91 Eros a couple years ago after servicing the headset bearings. It also has a keyed washer, but it kept working itself loose until I firmly tightened the lock nut against the top cup (using a large adjustable wrench on the lock nut.) Now that I do that, it holds its adjustment pretty darned well.