When I got my Iso grips they were for a harley, I had the same problem.
I filed the throttle tube down till it fit properly.
The tube was a larger diameter than the space in the control switch housing.
It is not the handlebars that are the problem.
mine was still snug when I finished but I like the cruise control.
Last edited by snekeptp; 05/01/2005 4:30 PM.