Originally Posted by Gummee!
Ritchey WCS and a 'sorta prototype' Ouzo Pro cross fork.
I didn't try the stem on another bike (I have a slightly different WCS stem on my Quattro Assi) to see. PITA got too big in the humidity.
That is odd, it all should work together just fine. The only thing it could be is the stem is not cut perfectly flat on one side. I have never seen that before though. If it is the steerer tube of the fork causing the issue I would throw the fork away ASAP, but I doubt it is causing the issue. The headset could have worn bearings allowing the top cap to drop in a little more. How old is the headset and has it ever been overhauled? I have never seen a CK headset bearing wear out either.