I am looking for a threaded top race for a 1" headset. The bearing cover on this Shimano is plastic and has become brittle and cracked. I'm surprised that Shimano actually made such a POS. The headset is OK except for this, so I'm trying to extend its life.
I assume the plastic cover was originally pressed on to the nut.
Never mind, I have located a replacement top race. I am good to go.