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I think he was impling that the keyway is still there on the pulley after the machining, its just alot less deep and the key needs to be machined to fit in the smaller space. So does the machined crank pulley still look safe? And is there enough room to cut the key way deeper still? The one thing that worries me about machining the key down is weakening its grip on the crank. I know enough people that have had keys destroy themselves and\or the pulley and crank with it with stock specs. Most of those were due to loose crank pulley mind you but its still something to worry about. I think I may have to dig up a 6m crankpulley part number and see if a local dealer can order me one.
 
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