So, my FSA No. 55 headset doesn't seem to fit quite right; the upper bearing is too loose and has play. The original bearings fit better. I also have to use the C-ring and spacers supplied with the Lightcarbon HRB17. Effectively, the only part of the FSA No. 55 bundle I'm actually using is the included expander. A question for everyone who has already built up their LTK: how much clearance do you have between the head tube and the fork at the bottom, and between the head tube and the handlebar dust cap at the top?