Well, I have just had a nose around in my shed and I have spotted 6 headsets fitted to bicycles that I know for a fact have crown races underneath them but I have also seen three loose headsets kicking about in there but only two crown races!!! Did one come with out a crown race? Has one been lost or stolen? Could small animals or insects get in my shed and eat a crown race? This is getting so deep. I'm thinking of setting up surveillance cameras on each of the headsets.