Indicate the Rotor Head
Here are a couple of pics on indicating the rotor head. There was a post a few days back asking how important the clamp screws are on the head and this indication proves to me how important it is.
Unfortunately Century split the clamp 90 degrees from where they should have. Or did they? Maybe they did it this way on purpose. With the slit where it is now the head tips in a direction that is 90 degrees to the blade grips. That means even if you didn't have each screw tightened to the same degree, it doesn't affect the TIR in the direction of the blade grips so much as 90 degrees to the grips (assuming only two blades). However if Century split the head in the same direction as the grips you could indicate the head almost perfectly using the clamp screws on each side of the shaft.
As it stands in my photos the TIR of the head in the direction of the blade grips is .004 whereas 90 degrees to the grips I got it to within .001. Before I started balancing the clamp screws it was almost .010 TIR so I would say it is worth it even though it doesn't affect the head very much in the direction of the grips. To me it is not good to be so far off in the other direction.
What could be more fun?