Slipping cog--hub damage?
So I was doing skids in a wet parking lot today, and my cog was slipping on my hub. This is the second time this has happened. I get home and tighten the cog and lockring--hard. Rotafix for the cog, lockring tool for the ring. Before I did this, I removed them to have a look at the threads and make sure the cog was adequately greased. The hub threads looked normal, but there was a small ribbon of aluminum--maybe .5 mm wide and very thin--stuck to one of the threads of the cog. Is this something worth worrying about, or should I just not sweat it as long as the cog stops slipping? It's a Formula hub, EAI cog, DA lockring. Oh, and before I get crap for noob questions, yes, I did use the search feature.
Me talk pretty one day.
Assuming you're using an aluminum EAI cog and you're sure your hub is okay, it sounds like you've stripped your cog partially. Get a new one. Someone else can chime in on this, but are the EAI cogs wide enough for the Dura-Ace lockring to fully tighten against them? Either you didn't torque everything down enough in the first place or something in your setup isn't quite compatible.