Have any of you seen headsets that use a standard wrench instead of metric? Mine is "Trek micro-adjust", according to Trek's brochure for that year, and the flats measure right on 1-3/8" with my caliper. The 35mm size wrench seems to be rare... the only one I've found is the aforementioned Zogs one. Then again, I had a hell of a time finding a thin 12mm wrench for the brakes on the same bike, and when I did find one, it was in a cone wrench, also from Zogs.

Only the top locknut has wrench flats. The top "cup" - the part that goes just above the ball bearings - has a knurled surface instead. I suppose I'm supposed to hold that with "Channel-Lock" pliers while turning the locknut with the headset wrench, ya? This is a lot like overhauling wheel axle hubs, isn't it? I've gotten pretty good at that.