Look carefully, and you'll see there's no split in the extension clamp. It doesn't operate like a clamshell - instead, a hidden wedge beneath the extensions are pushed up as the bolt from underneath is tightened, which pinches the extension against the top of that circular clamping area, and simultaneously affixes the whole assembly to the bar. Pretty clever, and it's what helps keep everything light. Overall, as I mentioned, it's a very well-thought-out bar, and by far my favorite offering from Profile Design in years.
Our second day on the Interbike showroom floor was another great harvest of gear photos and new info. Today we looked at a variety of things, from Campagnolo EPS all the way down to a simple BTA bottle from Profile Design. There's plenty of great stuff in the gallery - have a look, and check back in tomorrow for our final gallery.