I've got one of these (thanks to jambon). Not cheap - but would certainly recommend. Also helps stop levers from rattling. https://www.sjscycles.co.uk/cables/jtek-doublecontrol-s/
(Edit - right version linked now!)
That linked version is not for drop bar levers. I believe there's another version with suitable spec.
Ah yes - in my defence they look pretty similar...Updated and saved £5 in the process!
@Cupcakes started
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I've got one of these (thanks to jambon). Not cheap - but would certainly recommend. Also helps stop levers from rattling.
https://www.sjscycles.co.uk/cables/jtek-doublecontrol-s/
(Edit - right version linked now!)