Here's the slave cylinder, which is located under the transmission casing.  This diagram is as though you are looking up at the underside of the transmission.


The Slave Cylinder / Clutch Actuator: The input from the master cylinder (1)
The inputs from the HP (5), Return (8) and bleeder (vis de purge). The HP input is between my finger & thumb. with the dust boot & leak return
Here's an exploded diagram of the parts.
Interesting bits: 1) Master Cylinder Body;  2) Slave Cylinder Body  3) Slide Valve;  4) Piston in Slave Cylinder;  5) Pushrod that moves clutch throwout lever