due ruote 

Thanks, I'll keep my eye out for one of those. I figured a Nitto would work; was tempted by the Kalloy because they're readily available and cheap as, well, dirt. Hard to tell though from the picture whether the taper on the clamp would be sufficient to accomodate the bars.

wrk101, the removable face plate is very sensible but I'm a sucker for the clean lines of a traditional quill so I'm going to tough it out.