OK, got it off.
Kenny was right, a little PB Blaster does help. But it's really helpful to pry where 3 locating dowel pin are. With my not so good eyesight, I wasn't seeing those at first. Just apply a tiny bit of penetrating oil to those pins and you should be good.
Now, for my next question:
The flywheel surface is very smooth; it passes the twist test; there seems to be no obvious problems; however, the friction surface is discolored. Is this normal, or does it warrant replacement?
If difficult to answer without visual aid, I'll post pictures later on today.
Regards