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xpost: Mechanical ? 888/HS

So I've been wondering and pounding my head into the workbench for quite a while now trying to figure out how to keep my headset tight. My bike and a customers bike too...

Both are Marz. 888 forks with King Headsets. One on a Cuervo frame the other was on an M1...now on a Cuervo too.


I get them all tightened up and torqued, and within half a dozen runs I've got to retighten the damn thing. All I have to do is loosen the crown/stem bolts and it resets itself and then retorque the bolts. I never have to tighten the star nut bolt, so it's not like the star flange nuts are creeping up the steerer tube.

Anyone got some idea??
I am certain that everything is faced and installed correctly. I'm running no spacers above the Marz. stem either. First thought that maybe the headset spacer above the stem wasn't allowing the stem to tighten fully on the steerer tube.

Would one of those headlocker deals make it any better

Thanks you helpfull bunch of Monkies!