I finished installing a Trrig alpha one front end (love it btw) and noted that I was missing a small part on my brake. I have a Shimano Dura-ace Di2 lever and the missing part is a small hard plastic “washer” that fits onto the end of the cylindrical silver piece you initially slide the brake cable through. Without the washer cap piece, the silver thing catches on the lever when pressing the brake. I have another bike with the same brake that I swapped out but was wondering if anyone knew what this washing thing is called and where I could get another one. I looked on Shimano’s parts list but couldn’t find it and certainly do not want to buy a new brake lever. Thanks