A look at the parts diagram shows a weight inside the handlebars as well. Does removing either or both have much effect on engine other vibrations through the bars? I would think Honda wouldn't have spent the money there otherwise.
The bar end weights are too long and too heavy, causing a whiplash. The ensuing shock causes you to increase your grip on the handlebar, and that in turn increases the effect. It's a vicious feedback loop.
I removed the end weights (don't mess with the interior weights) and the effect was near magic. I also had a talented engineer friend who 3D printed some ABS end plugs for me so the handlebar ends didn't appear unfinished.
With the end weights gone, there was just a little "buzz" transmitted to the hands. This year I stumbled across the Kuryakyn 6285 Cruise Assist and the opposite handlebar matching end. They provide just enough weight to kill the high order vibration and at the same time provide a little style accent to the handlebar ends.
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