Well, the reason for asking is there within my original question; I don't know whether Campagnolo's stack height measurement of 36.5 includes a lock washer or not. Maybe one of you people can tell me? If it does not, then finding a suitable washer may be difficult as that mentioned 2 mm of height room isn't exactly accurate; it may be a couple of tenths either way. And then, if it happens I have to cut the steerer again by just a couple of tenths to make that new Campy headset fit, things can get ugly for the steerer. I'd rather have a headset that would be certain to have enough room for adjustment by spacers.

Anyway, what is the significance of crown race diameter and that elusive S.H.I.S ?

How do I know which headset will fit? Are all 1" threaded ones generally suitable or do I need one with specific crown race and other dimensions?