A cool trick for the throttle crank which goes on that stud is to find a thin-walled piece of pipe which fits on that stud, and drill the holes in the throttle crank for the pipe to fit in and weld the ends of the pipe ot the throttle bracket holes.
This gives you a much larger bearing surface for the throttle bracket to ride on the stud, resulting in smoother operation, as well as not having to worry about the grooves that are currently in that stud. Should last for 3,000,000 miles.
