Hey Guys, new to this board and very new to MBs. I just bought an '84 300D sight unseen, yea I know but it seemed like a good idea at the time. What I am told is that it needs the harmonic balancer re-keyed. I know what a harmonic balancer is but am not sure what we mean by re-keyed any ideas. I am not driving it at all till I get this figured out. Thanks, John