I am totally new here and hope that I am in the ight place. I have a South Bend lathe that the data plate says is a Model 89. I am attempting to clean it up and use it. I have run into a problem That perhaps others have solved. The lathe came with a 5 inch 3 jaw chuck that I cannot get apart. The backing plate comes off, the jaws are removed, the adjusting gear came out but the scroll will not budge. There is a pin? in the plate that does not seem to be threaded and has no access to the other end. could this be my problem? If so, how to solve it. The Pin? is at about 6:30 next to the lower attach hole in the picture.