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...Velo Orange is selling a similar ratcheting downtube shifter, in two different versions on their website.
The more expensive ones have additional pull distance, so the will work with 11 in the back. They are also selling the plastic washers separately. I, too, wonder why they are made from plastic. You can also find them on e-bay under the name "ene ciclo" . The levers themselves look a little more like Campagnolo NR levers. I ordered a set for a bike I'm putting back together in a month or two. If they are as good as everyone says, I might order more of the $55/pair ones. Maybe. Assuming they don't disappear again.