Joined: Dec 2011
Posts: 2,519
Likes: 18
From: Fort Worth, Texas
Bikes: 2000 Bianchi Veloce, '88 Schwinn Prologue, '90 Bianchi Volpe,'94 Yokota Grizzly Peak, Yokota Enterprise, '16 Diamondback Haanjo, '91 Bianchi Boardwalk, Ellsworth cruiser
Haven't seen something like that before. I think the bolt is simply something a previous owner used to keep the shifter set together in the right order. It's hard to tell from your photo, but if the bolt is removed, would those black plastic spacers then fit over a standard shifter boss?