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Side note, the mechanic setting up the box may have everything in spec but at opposite ends of the tolerances. I was a factory trained Robinson R-22 mechanic in the 90's. I did all my own blade tracking and balancing. Our customers would learn to fly our machines and buy a new Robbie after they got their certificate. They would bring their ships to our shop to have me balance and track their rotors. My secret to a smooth rotor was with a tilting head rotor system, I ran the head at the upper tolerance for tightness and the individual blades at the lower end of the tolerance.
My customers complained to the factory that their setup was really rough and mine was smooth. The factory actually sent their lead tech and design engineer to our shop to have me adjust their factory ship using my procedure and show them the process. They could have just used my procedure on their own, but they wanted see me do it. As advertized it worked and they adopted the procedure as far as I know.