Mine was stuck when I bought it also. I engaged the back gear and used a piece of 2x4 and hammer to hit one of the jaws on the chuck and it spun loose. But you have already removed the spindle so I only have one suggestion. Use wood blocks in a vice on both sides of the spindle shaft and try hitting one of the jaws with a piece of 2x4 and hammer. Comes off counter-clockwise.