Something like this:
https://www.velovitality.co.uk/products/nitto-as-3-rear-cable-hanger
only seems to be half of the story, there is cable stops at the front of the tube but none at the rear.
@Glws started
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Something like this:
https://www.velovitality.co.uk/products/nitto-as-3-rear-cable-hanger