Well, he kept cracking his nuts. Now why would his Rocker Arm Stud Locks Crack? Side Loading. That is the answer. Now for the most of you that really can be a problem. Fact is you have to "Machine" the top of the Rocker Arm Studs to Correct Height. In the process this Top Cut should be Perfectly Perpendicular to the Rocker Stud. If not they crack.