I've read and re-read your post. The crank is much harder than the balancer. The balancer is two pieces that have a rubber interface molded in during manufacture. If the balancer wobbles, remove it. Measure the crank dia with a dial gauge. You'll have to put the bolt back in and turn it by hand. also measure the id of the pulley. My thoughts are, the pulley is shot. Buy another and be on your way.