Pd had told me to heat it up, and it would slide off, but when I couldn't slide it off, I called Wayne and he said there would be a snap ring on both sides. I had no snap rings, or even groves for snap rings. I heated it up enough to make it slide down, and then discovered the mushroom. It was very slight, but it would stop it cold when it came to it. I filed it down and it slid right off. I was thinking somebody must have put the wrong axle, or shaft in it when there wasn't any grooves for snap rings, but it sounds like some of them didn't have snap rings.