HELP!!! I recently aquired a 2003, "almost new," 1200 Custom Sportster. I've only had one ride, and the vibration coming from the handle bars really concerned me. After a bunch of research, I understand why the vibration is so strong, but I'm not clear on what I can do to remedy the situation. Are there really any grips that alleviate the extreme vibration experienced at 60-65 mph???? The seat and foot pegs are fine.