I am stringing my 03' S-Works E5 frame set with DuraAce brake cable sets. They came with cables, housings, and two black brake cable ferrels. The Ferrels are too big to fit into my 105 calipers or brake cable points on the frame. The silver shifter housing ferrels fit the frame but still will not fit the calipers. It's like the frame takes the small ferrel and the brake calipers don't take any ferrels at all ?!?!?! Any ideas ?