Originally Posted by Snipe
Try a penetrating oil called "Kroil" that stuff really works. It's a little pricey, but you get what you pay for. I have used it in the shop before retiring, and NOTHING beats it. Just type the word "Kroil" into your browser and it will take you to their site. If that doesn't do it, about the only thing left is heat. Lots of it. Best of luck....
+1 on Kroil. I also have it in my shop.