I asked around on the /2 mailing list and got a few suggestions. I can either buy a crank balancing stand and a big hammer and true the crank myself, or I can do it right and send it off for a proper rebuild. Since the crank is already borderline in a couple of other areas I'm going to send it out. It's the core piece of the engine and if I'm going to rebuild this thing right I need to get the crank right. Either way I've got to take the engine apart again, which I might start on today.