[Healeys] Clutch slave cylinder

[simon.lachlan at alexarevel.plus.com]

I am trying to get my head around the workings of the clutch slave cylinder
in my MkII BT7.

Plainly the fluid comes in the back, underneath and pushes the rod outwards
ie towards the rear of the car.

1.	So, what is the purpose of the spring behind the piston/rubber? 
2.	Is that (silly little) spring supposed to do anything? It certainly
doesn't seem want to push the piston anywhere..
3.	With the slave cylinder on the bench, I can push the piston in with
my thumb. Bit stiff, but I suppose that's to be expected. How easy should it
be and should it spring back? 
4.	I've used a rebuild kit from one of our better suppliers..are these
kits problematical? I recall that, for example, the servo rebuild kits
were/are notorious.

I rebuilt it, reinstalled it and the whole issue was solid as a rock. No
movement of the rod at all...

I'm going wrong somewhere. Surprise, surprise! But it seemed like a
straightforward task and, barring some access issues, the spanner work is
simple enough.

Any clues?

Simon

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