I’ve had exactly the same problem, mine is a disco 1 200tdi I changed the clutch, master cylinder and slave, would it bleed properly NO, I tried the one man none return valve method very poor clutch, I found I had to pump the pedal like blazes to get any type of clutch, I then borrowed a easy bleed kit from a mate, but first I took the clutch damper out of line and connected directly to the slave, the damper is a waste of space and just adds to the problem, connected up the easy bleed pushed pedal got clutch. The feed pipe from the master fits into the slave, taking the damper out of line will not cause you any problems at all.