Long story short: I almost pressed in the wrong headset into my Mojo! I was about to press in aluminum cups into the aluminum sleeves in the carbon headtube. The headset is from a non-IS integrated headset that I thought would fit; it was an internal headset, but not the right bearings/type.

Tom answered, gave me a very clear explanation of how I was screwing up and how to get the right one. He laughed and said that would have been a tough one to deal with. I told him the "just riding along....in my living room" would probably not have worked.