Just wanted to update this thread, my buddy with an m4 spun his crank hub and just got a new one put in and really wanted to have the CBC installed at the same time as well to save on labour and bought mine. So I cannot install this as intended, and will likely either wait for it to go on sale again or just for go this part if it isn't on sale since the N55 doesn't suffer from crank hub issues and the CBC was just something for me to fiddle with.
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