Headset fitted

Got the M:Part headset fitted today at Green Machine in Horwich. Dead reckoning had predicted there would be less than 1mm of fresh air from the top of the stem down to the top of the steerer tube; in reality it turned out to be a lot less.

In fact there wasn't enough room for the dished underside of the cap to drop into, preventing the top of the cap from fitting flush.

So for now there's a 2.5mm spacer under the stem, providing sufficient clearance for the cap to fit perfectly.

Ultimately the spacer could just stay there (it only weighs 1g), or it could swap places with the stem; or it might become redundant if either headset or stem gets replaced with something (slightly) taller, or if the cap gets replaced with something different. A custom titanium cap, maybe? Only problem would be that I presume a titanium cap could only be secured with a titanium bolt...