Some slaves had it, others didn't. I remove (unclip) the slave from the bellhousing and let it hang. Disconnect the master cylinder rod from the clutch pedal linkage. Cycle the slave slowly by hand about 10 times. Reassemble and you should be good. Cheers!
Helps if, while cycling, you have an assistant who can look for bubbles rising from the master as you cycle it (this is for a slave without a bleeder, where you're essentially pushing the air back up thru the system).
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