Clutch pedal vibration

[tree98]

Is the clutch fork adjusted properly? I had this "pedal vibration" issue on 2 trucks in the past. Both had clutch forks that were out of adjustment by quite a bit.
They are only supposed to be 1/8" from the throw out bearing. It is adjusted by lengthening or shortening (lengthening if the gap is greater than 1/8") the linkage rods that attach the pedal to the clutch fork.
By the way both the trucks I had problems with, came this way from the factory....... WAY out of adjustment.