I have a Parker #2 surface grinder, bearings are being replaced. Front bearings were easy. This spindle has the integral motor, the rotor is pressed and keyed. I am having zero success getting it off, I have tried a puller and the puller and some mild heat, it moved a 1/4 inch. Is there a trick to these or is this one just good and stuck? Im wary about putting in on a press, the rotor body is aluminum. Anyone battle this one?