Originally Posted by rschulze

If this is a new Zipp 404 then it's a common problem, I went through the same thing. The shop I brought it to said they had been flooded with these. The threads are the right size, just not cut deep enough. What the shop did for me is to take a steel, not alloy, lock ring and lube the threads with cutting oil and used the ring carefully and cut the threads deeper. Worked like a charm, now the alloy ring works fine. I'm not suggesting you try this on your own, you may screw it up worse, kust passing on my experience with the same issue