Waldig also threw off his lower LET crank pulley, he says the keyway let go.
My thoughts on crank pulleys that shake off are that they are unbalanced, you might want to check for signs of balancing on your ribbed pulley. The Harmonic balancer portion of the pulleys are appeared balanced in pictures, but from conversations with LET, I'm not positive that the entire assembly is balanced together or if the ribbed pulley was neutral balanced prior to assembly to the harmonic balancer.
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