Ritchey Headset Help

Help!
I'm trying to remove my Ritchey Logic headset, and having a 'mare.
I've removed the stem and the stack rings, however when I go to drop the fork out, it's well and truly wedged.
The top of the headset seems to be jammed on.
There's a tiny split-ring on top of what appears to be the plastic bearing cup! That's jammed solid, and no amount of tapping it round with a screwdriver and hammer seem to make it budge.
I'm assuming i've done something terrible, as whacking the top of the steerer with a mallet fails to make it move at all (with the forks held off the ground).
The headset and frame are about 5-10 years old (the bike was one of the last steel Spez. Stumpys) - awesome, but now suffering from a gritty headset.
I'm trying to remove my Ritchey Logic headset, and having a 'mare.
I've removed the stem and the stack rings, however when I go to drop the fork out, it's well and truly wedged.
The top of the headset seems to be jammed on.
There's a tiny split-ring on top of what appears to be the plastic bearing cup! That's jammed solid, and no amount of tapping it round with a screwdriver and hammer seem to make it budge.
I'm assuming i've done something terrible, as whacking the top of the steerer with a mallet fails to make it move at all (with the forks held off the ground).
The headset and frame are about 5-10 years old (the bike was one of the last steel Spez. Stumpys) - awesome, but now suffering from a gritty headset.
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VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
I completely forgot to give the outside of the steerer tube a good spray with lube - I've got WD40 - Is Plus Gas better? Just wondering whether to track some of that down as well?
Have given it a good spray and retreated until tomorrow evening when I shall return with mallet in hand!
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
So, the more you tighten it the more it wedges in and the more it gets stuck.
I've used a big iron tube and a pair of trousers :oops: to take the fork out.
1-Grab your old pair of trousers (preferabily jeans as denim is more resistant) and cut one of its legs out.
2-Tye the piece of denim to the frame in the place where the headtube meets the downtube. The piece of cloth must be wrapped aroun both toptube and down tube and you must have some slack above the toptube.
3-Put your big tube through the gap between the top tube and the piece of jeans. The end of the big tube must seat on top of the fork tube.
4-Push up the end of your big tube that is further away from the fork. Since you have a big long tube you can use this leverage to force the fork down.
I've used a piece of my old jeans cause a wire (the first thig that came to my mind) would damage the paint and would probably dent the downtube.
You obviously need to hold the frame still by pushing the tobtube down as you push the big tube up. Spraying it with something also helps.
Goood luck!
I put the saddle back on, took the bars off and turned the bike upside-down.
Placed a 2 inch block of wood under the top of the fork tube.
Firmly grasped the down-tube where it meets the bottom of the head tube (it's upside down still, at this point)
Picked the frame up about 4 inches, then swung it down on to the block of wood, applying my full weight at the same time.
Thunk - top race popped right off!
Bottom race and shell disgustingly surface-rusted.
Will see if I can get a new race / suggestions for replacement.