[Eliot Ness]

It's probably just frozen from being in there for over 70 years. I'd drip a little WD-40 or Liquid Wrench along the shaft/sleeve and in the set-screw hole and just let it sit overnight. It's sometimes amazing what a little lubrication and time will do.

There is a way to replace the belts w/o removing anything. Alan Jesperson and Mark Oppat sell O-Ring material that you cut to length and then glue using fresh super glue. Some guys love doing it that way and others don't have very good luck with it at all. I used it on a 6-S-229 when I was in a hurry and didn't have the correct size belt or O-Ring and it worked OK. I still prefer using the correct size O-Ring, but just mentioned that method as an alternative.

http://www.alanjesperson.com/gn_repro.ht...al%20Belts

http://www.oldradioparts.net/