I realize this will be different for all headsets, but:
I have a Tange Levin headset. The headset is starting to show wear: the fork sticks at regular intervals through its turning.
I've inspected the races and they don't show any visible sign of deformation. Is it possible that only the ball bearings have deformed and that the races are fine? Is it worthwhile to order replacement bearings and reassembling the bike? Has anybody had success doing this?