Here's a couple more adjustable stem pics:
http://bulgier.net/
There is a TTT version of that Ambrosio stem that's essentially identical,
just renamed, but TTT also made an adjustable stem of a different kind,
essentially an aluminum Major Taylor:
http://bulgier.net/
Maybe most racers would use it with the handlebar clamp flipped underneath the extension, but this ex-racer appreciates the ability to get the bars up higher. Most Major Taylor style stems have this ability.
Mark Bulgier
Seattle, Wa
USA