So the headset on the Erba keeps loosening up just enough to get that slightly-loose-headset-sound, and I can't for the life of me figure out why. Am I just not tightening down on the top nut enough once I get the pre-load right? Is there some headset secret I somehow missed out on? Like the BB one about putting a skewer through the spindle to hold the BB tool in place (nearly killed someone when I figured that out)... Hatta Swan for what it's worth.