Does anyone know anything about Fontan bicycles? I recently purchased one (70's era) and am looking at restoring it. I haven't been able to find much about them anywhere. Is it worth doing? I do know that the Simplex Prestige derailleur (the pulleys are broken on mine) can be replaced by SunTour VT's, but that's about all that I have been able to find. Any help would be greatly appreciated.