Originally Posted by
danec99
I barely tightened it! Was just getting started on setting the brakes up. when the little clip that secures the brake cable to the brake just crumbled. My first thought was threading the cable through a washer - Any other ideas on where or how I could replace this fairly crucial part? Thanks!

I just tested a new Shimano 6700 rear derailleur's cable anchor washer on my 550's. The washer's bent tab fits into the brake arm's slot perfectly, but the washer's hole has a smaller diameter than the brake's anchor bolt.
Finding a derailleur's tabbed anchor washer and filing the hole to a larger circumference should work.