Hidden headset

[Charles Beristain]

I have the campy hidden headset... less than 1000miles ..got play in
the bottom bearing/cup... Since I don't know anything about the hidden
headset, I took it to the shop.. the replaced the lower bearing but
that didn't solve it.. required a lower cup replacement as well. It is
fine now.

what would cause this so early in the game?

where can I see an exploded view of a hidden headset. I would like to
learn more about them. I have cannondale mountain bikes and they all
have cups/bearings pressed into the head tube .. do the road bike
hidden headsets look the same only smaller in diameter?

thanks
charlieb in ct.