Curious, I assumed it was to stop a clamp from slipping?
Yes. Probably. I've only seen them on the top of the down tube sometimes in nice shapes like hearts.
You'll obvs need some sort of band-on cable guide now. Or you might be able to get some stops braze on, although that would quickly add up.
@hugo7 started
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Curious, I assumed it was to stop a clamp from slipping?