When I installed the Kuryakyn ISO grips I threw the old grips and handlebar weights in my box o' parts. I recently came upon a site where a guy had married the bar weights with the Kuryakyn grips. The weights actually matched well with the grips and many people reported the weights lessen hand fatigue on long rides. I decided to try it.
It takes some modification to make the bar weights work with the Kuryakyn grips. The inner part of the weight needs to turned down to ~5/8". For that I used a Eureka metal lathe. The inner part needs to be shortened by ~1/8" and I used a Eureka metal saw for that.
I used a few washers on the throttle side to keep the weight from rubbing the grip. A splash of paint and they were ready to installed.
The finished product.
I couldn't get the Throttle Boss to work with the weights so I tossed it in my box o' parts.