The Marzocchi PFP forks run a load of preload on the ICS spring, and then the PFP allows you to wind on even more.
I prefer the stock ones with a little free play. It's not an issue that the damper rod doesn't extend all the way back on it's own. You can still pull it out the last bit by hand and it should extend smooth with damping. Once installed you still have the outer spring keeping it at full extension.
Allows the first bit of travel to cavitate a bit and then the pressure ramps up. I don't think this is a bad thing for a trail setup. End of the day it's just another variable.
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