[Jaydee]

It could be some of the diaprham fingers have broken of , and cocking the throw out bearing, jamming it on the shaft. Especially if the grease has dried up on the shaft. Will it jam without the engine running? If so, work the clutch until it jams, then loosen the bleed nipple on the slave, if the clutch jumps back, then the mc is jamming.
JD