Sturmey Archer made and I think still makes a Top
Tube cable stop. two of them would do the job . I would find the earlier
metal inserts. The finish was pretty nice also.
My Follis Tandem uses a Campy chainstay gear cable stop as
part of the run to the rear brake
BOB FREITAS
who rode an 'English Racer' way before he got to MILL VALLEY, CA USA