Originally Posted by maartendc

just fyi, i used that liner cable from amazon, worked absolutely perfectly!

The inner diameter is just ever so slightly larger than the shifter or brake cable. You just slide it over the old cable, through the frame. Then, slide out the old cable, and slide in the new cable. Very easy, and no risk of the cable getting lost at any point.

I would definitely use this method again in the future, and not bother with any other method.