I bought 2 new rear tires for my old John Deere ( I think it is an LA 110) and the first wheel came off easily after removing dust boot, C-clip and washer. Unfortunately, the other will not budge. Have tried 2 different penetrating oils and have tried hammering with a large dowel to the back of the wheel, and even a small screw jack between frame and back of wheel. Trying to be careful not to mangle the wheel! Any advice? Haven't tried heat yet. The gas tank is not far from the working area!