Fitting brake cables on Tektro rl726 levers
Yes, you have to cut off the stopper you don't need.

In your case, cut the non-torpedo end. Take a look at the picture here: http://www.tektro.com/_english/01_products/01_prodetail.php?pid=58&amp;sortname=Lever&amp;sort=1&amp;fid=3

Under "Specifications", "Brake Cable Type" it has a picture of the end you need to leave attached.

Happy Riding!