[Meir]

I have just completes a clutch job, inclueding a new slave cylinder.
Since I had the transmission out, I installed the slave cylinder outside the car just to see how it goes. I notices it is a very tight fit.
What you need to do, is clean the slave cylinder socket as best as you can.
Put some soup on the cylinder, and wiggle it in.
Connect the fluid line only after the cilinder is in place.

Hope it helps.