How to fasten main cable to BR-CT91 (Shimano Altus) brake? Basic question, but it isn't addressed in instruction manual that came with the brake.  

In picture, (from left to right), there is the brake, a bracket, a rubber washer and a nut.  Where do I a thread the cable through?
The cable is threaded underneath the L-shaped bracket, in the corner of the L. The cable is clamped between the bracket and brake body.

You may see a shallow slot for the cable in the bracket at that point.