Originally Posted by maniac57
I'm guessing the problem is your ball replacement "bolt" self-destructing while riding allowing slack to develop.
Replace the lost ball with an 8mm bearing and be sure the bucking bar is not already worn down.
And lubricate all of the clutch actuator parts well with a good grade of bearing grease. This is a step many neglect and suffer the same symptoms you have because of it. Oil or WD-40 won't do the job.