In my ignorance of all things road bikes I bought a new, braze-on version, unaware that the clamp-on one I had was retro-compatible.
FD-7800, Dura Ace front mech with 31.8mm clamp (you will need a small washer for the bolt to use it as braze-on though), the clamp is a bit tatty and there is a little wear to the inner plate, but it still functions perfectly with no play. £10
[img]http://farm3.static.flickr.com/2174/2239740452_03eba714ab.jpg[/img]
[img]http://farm3.static.flickr.com/2106/2239740750_a436cb00ba.jpg[/img]