Stuck case, arrrrgh!
Boy, I really like Brickeyee's set-up...BUT, I hope I never in life have occasion to try it. Already BTDT with the stuck case, thank you kindly!
While you're setting up the Brickeyee Stuck Case Remover Assembly, try some Kroil, a penetrating libricant. It seeks out the smallest openings and crawls between the surfaces. Can't hurt, might help. I'd apply it to both ends of the stuck case if possible.
God Bless America