[Doug Houston]

I've been there; done that. It appears that the vendor, who supplied Philco, used a lubricant on the shaft, in the bushing. Well, it seems that the lubricant has turned to glue, over all these years, and you can't move the shaft with an impact wrench. This was on one of my sets; a Philco, of course. I had a Weller soldering gun, with a broken tip. I took the two ends of the tip, and touched them to opposite sides of the threaded bushing. This works best if the nut is off, and the bushing receives all of the heat. I had a knob on the shaft, and as I heated it, and the shaft began to turn. The switch won't turn with the nut removed, because it's keyed to the chassis. From there on, you can put a little squirt of alcohol, to dissolve the old lube, then put a little drip of 3 in 1 oil, and you're good for another 70 years.