Joined: Aug 2009
Posts: 4,955
Likes: 13
From: Central Maryland
Bikes: 1949 Hercules Kestrel, 1950 Norman Rapide, 1970 Schwinn Collegiate, 1972 Peugeot UE-8, 1976 Raleigh Sports, 1977 Raleigh Sports, 1977 Jack Taylor Tandem, 1984 Davidson Tandem, 2010 Bilenky "BQ" 650B Constructeur Tandem, 2011 Linus Mixte
That was not uncommon to see on older bikes. It seems it would be pretty easy to put a second boss on the left side, but that would ruin the aesthetic of a bike that was intended for only a rear derailleur.