I hope that someone can help me with this. I wanted to clean my rotor blades so I proceeded to disassemble them. I had a hell of a time lining up the 8 blocks that hold the blades to the bar. At the time all 8 blocks looked the same but when I was putting the blades back together I had to mix and match them in order to get a combination that did not bind or require a hammer to force the bolts in. It took me about an hour to find a combination that fit together without binding. It reminded me of a rubix cube. Are all of these blocks the same? or is there a slight difference in the hole locations. I will mic them the next time that I remove them. I must have them on right because everything runs smooth with no vibrations at the rotor.