[urq] Clutch Slave Problem?

[racingiron at comcast.net]

I hadn't started the urq for over a month until I needed to move it to help a friend with some fluid changes on his bimmer. I noticed that the clutch pedal felt a bit strange when depressed, and it was a little reluctant to return when released, but it did come up on its own. After one or two press/release cycles, the pedal went completely stiff (won't depress at all) and the clutch seems to be disengaged (shifter will move into gear positions, but car still rolls freely). 

I'm guessing the slave piston is jammed. I tried tapping it with a hammer, but can't get much force on it. I opened the bleed screw and extracted some fluid with a vacuum bleeder, but no change. I decided to pull the slave, and after some persuasion got the roll pin out. However, the slave is still solidly in place, probably because it's got clutch spring pressure against it. Anyone have any suggestions for removal or other diagnostic tips? 

TIA, 
Eric R. 
'86 urq 
'92 urS 
'93 urS