While doing mid-winter season cleaning of my commuter (http://www.fixedgeargallery.com/2005/dec/boe_fixed.htm) I was really sad when I found some play between my miche cog and adapter. The lockring is really tight and couldnt be thightened more. I was really carefull installing the lockring and I had worked pretty much with fixed gears, im not a complete idiot anyway.

It was late and I didnt take the lockring of to see if it was the cog or adapter or both that had been disfigured.

Anyone else had this problem?