Ever since fitting a T5 gearbox and heavy duty clutch to my Rover V8 it hasnt felt right.
Messed about shortening the pushrod, then lengthening it again(!)
Finally I think the problem is because it doesnt always return properly. Sometimes the clutch pedal (which has a spring) has come fully up, yet the clutch is still on. When this happens, you can usually get it to move by pressing clutch pedal up and down.
The slave cylinder I'm using is the one which came with the box, I'm thinking this is the most likely cause.
Just thought I'd ask for your thoughts before I go and spend more money I haven't got!