'01 GL1800 - put on new tires, had a senior moment, forgot to balance the front wheel. Test ride revealed minor vibration (SURPRISE!) and low-speed decel headshake common on the GL1500 but never before a problem on the GL1800. I removed and balanced the wheel, which required a BIG hunk of lead, reinstalled and the test ride revealed...ABSOLUTELY NO CHANGE! Vibration is the same, low speed decel head shake is the same. Hard to imagine that much balance weight made no difference. What am I missing? Any suggestions? Thanks in advance for any help.