I have used the PB blaster and hammer, I have not thought about the impact gun... I have also used a 5.5' pipe extension on a half inch breaker, and broke the socket.... I think I will give the star washers a shot, with the pb blaster and hammer all at the same go.... This is almost fun...

Thank you for all the help to this point, if I have to weld something onto the cup, I will post pics :-)