hamster wrote:A Middleburn Cable Oiler is exactly what you describe.
Excellent. What a responsive company. Did they 3D print them?
I think I'll buy a few. I've had my rear brake and my rear derailleur freeze up in snow, and at best they can be made to work for a few minutes before the same thing happens again. It's hard to believe that a bit of ice can completely resist the mechanical advantage of the brake lever, but it did for me.
Edit: On investigation, I can't seem to find any. There are ugly cuboidal ones with a set screw, and that can be used on motorbikes, but none of the neat Middleburn ones. What a shame.