Only way it can hit the hub springs are 2 things, Either the pedal was set way too high allowing the slave to travel farther than stock or the clutch kit itself is not set-up correctly or mixed/matched components.
I HAVE seen this before with a new JWT kit, If the clutch pedal is set too high it can over travel and the diaphragm spring will hit the clutch hub, turned out to be a problem with the clutch itself. After the clutch broke in a little it stopped doing it. Basically once the clutch seats in a little the diaphragm spring in the pressure plate will rise as intended and will give more clearance between the clutch hub and pressure plate spring. The other customer had told me if he let up on the clutch a little bit it would release and if he held it to the floor it would not release all the way and there was a noise, This told me what the issue was immediately.
The ZSpeed HD CSC slave will not travel any further than the stock slave, They are identical in bore/volume.
I have never seen the clutch actually get damaged from this though, It will just rub a spot on the hub, make a little rubbing noise and not release if you hold it all the way down to the floor and keep it hitting the hub effectively making the clutch try to engage as you are pushing it onto the flywheel.
Glad you got it fixed regardless!
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