Vibration cured thanks to the GSP9700 !
Thanks to DDALDER'* suggestion to find the "Road Force Balancer" my vibration is completely gone and my Bonneville rides like a magic carpet. The balancer uncovered a defective brand new tire - which was replaced - and was able to prove to Firestone that their balancing machine was out of whack. I have to give credit to Firestone for replacing the tire based on the results of the GSP9700 diagnosis with no questions asked. They just need to get their balancer fixed or replaced. By the way the Road Force Balance for all four wheels was only $ 32.95 + tax and materials. A success story thanks to this Bonneville Club Forum !