This may be sacrilege but can you simply glue the cable guide to the shell? I used some contact adhesive to glue a cable guide to the BB shell of my cannondale and it's still there 2 years later.
Oh, and bike is beautiful.
I did this too with an old Raleigh, you've got the tension of the cables holding it onto the curve of the BB shell so it should be fine.
@branwen started
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This may be sacrilege but can you simply glue the cable guide to the shell?
I used some contact adhesive to glue a cable guide to the BB shell of my cannondale and it's still there 2 years later.
Oh, and bike is beautiful.