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All of our bushings in the beginning were red. They should be marked with a "S" or "M" or "H" standing for soft, medium, and hard. The latest bushings are color coordinated Blue (Soft), Yellow (Medium), and Red (Hard). Soft = 83a... Medium = 86a... Hard = 90a...

The nut should be tightened all the way down. You can check to see if it is tight enough by a simple test. Turn your board upside down. Stand on your board to keep it from moving. Now try to "rock" the hanger against the kingpin the way a RKP functions. There shouldn't be any movement in this direction. If there is -tighten the nut until the rocking is eliminated. The only movement is the rotation of the hanger via the ball bearings.