Just to add to some of the previous comments. The Dura Ace freewheels were excellent and the body mechanism in particular was well made. If yours is wobbling, I would guess that it is a high mileage example and showing some signs of wear as they generally were well machined and would track pretty straight from new...It may have spent some point in its life un(der) lubricated and also may have had water contamination...I think this is an issue unrelated to the chain skipping. If the chain is good, it is almost a near certainty that the skipping cogs are worn. It's sometimes very difficult to determine by visual inspection. I wouldn't be surprised. As good as these freewheels were, their cogs didn't wear as well as those from Regina or Maillard (Sachs) which were VERY hard wearing..but everything will eventually wear out. I'm not sure I would track down cogs if the body is showing these signs of significant wear.