I have on my newly built bike a phil rear hub, phil cog and phil lock ring. The lock ring fit pretty nicely when I put them together a few weeks ago. This meaning that most of the threads on the lock ring are mated to the hub. Today I picked up an EAI cog (the black one) in a smaller tooth number as to gear up a little. I swapped out the cog and the lock ring doesn't fit on the hub the same way. It does thread on pretty well, I had to rotate it a few times for it to fit snugly. But there are a few threads of the lock ring showing on the inside, like the EAI cog is thicker.

Anyone have any experience with this? I haven't taken it out yet, I dont want to mess up my new hub.