Yeah, the spacer can catch you out. They can sometimes be aa bit reluctant to come out. I think it was the oracle Luddite who gave me the tip of tapping the slave on something firm to pop it out.
I think the idea of stopping the rod from spinning is to remove any chance of the piston spinning in the slave, which can't be very good for the seals. I have a theory that the piston spinning is the reason for the clutch fluid always turning black in pretty short order. However my fluid still turned black after I fitted an anti-rotation rod... I hope you have better luck.
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