I had this bike shipped to me and can't remember how the headset is supposed to go back together. Is there an exploded diagram of where the C-clip goes and the order of the other components?
The circlip is the last thing to slide onto the steerer after all the other parts of the headset have been fitted.
The idea being that it holds everything together even when the stem is removed.
The first Dia-Compe aheadsets included them, but it was quickly realised that it wasn't really necessary.