All right.. thanks for the reply.

I'd been wailing on them a bit from the back with the mallet.. I'll keep trying that. I thought about wd40 too.. I guess I should avoid spraying it inside the back of the assembly though..

THANKS!! Back to the lab I guess. Hopefull they are not so grooved they will never come out..

UPDATE: Some oil on the front and a lot of beating on the back of the rotor and it came right off. New one slid on without a fuss.

THX!! Very appreciative!