Cable stops/barrel adjusters
https://www.sjscycles.co.uk/gear-spares/shimano-alloy-braze-on-down-tube-cable-stops-with-barrel-adjusters-st66006603/
(Don't know if there's a special single one for mounting on the top of the tube rather than the sides. Don't think I've seen one though, and you'd want the cable to run to the side to avoid the pump peg anyway.)
@jsabine started
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Cable stops/barrel adjusters
https://www.sjscycles.co.uk/gear-spares/shimano-alloy-braze-on-down-tube-cable-stops-with-barrel-adjusters-st66006603/
(Don't know if there's a special single one for mounting on the top of the tube rather than the sides. Don't think I've seen one though, and you'd want the cable to run to the side to avoid the pump peg anyway.)