>We have nifty Minoura adaptors that let you mount one or two
>standard cages to your bars. See:
Yes, those are nice, I've got three doubles and a single. Also there's a very nice clamp-on adapter (BH-95) which works on handlebars and frame tubes for those without braze-on mounts. Another item is the removable cage clamp (QB-90), I didn't think it would work very well, but I was surprised. I've even clamped it to the stem extension and it's held well.
http://www.minoura.co.jp/index-et.html Click 'Accessory' and scroll down.
I was out on a road trip for work, and looking for a single mount before I could get to my LBS. I stopped at a shop and asked for one, the shop guy looked puzzled for a moment, then pointed to the classic poster of Coppi and Bartali on the wall, and asked, "You mean something like that?"
I smiled, and said, "Exactamundo!"
Roy "satisfied customer" Drinkwater Lititz "pigeon Italian", PA