Originally Posted by JamesGoodman

Yes, it was the stock hub. The threads on the "freewheel" side are about half the width that the guys in the shop expected them to be (and half the width as they are on the free side of the Phil Woods hub and the other track hubs that the guys in the shop were used to looking at). They were afraid that that was not enough thread to be safe with the freewheel, which is obviously wider than a cog. But the consensus here (and at Jamis) is that because of the way that the freewheel threads and the natural tightening that occurs with every turn of the cranks, this setup is perfectly safe. The guys in this shop were just being extra cautious with a set up they weren't used to seeing. Here in Manhattan, the vast majority of single speeds they see are FIXED. I left the shop a little poorer for the confusion, but with a great set of wheels at a good price.