My neighbor has a stock T-Maxx 2.5. He removed the retaining ring from the top of the air cleaner when he cleaned the foam element. Now the top retaining ring will not seat back on the air cleaner, the foam keeps pushing the retaining ring off. The ring does not snap on and it does not have a pressure fit. He asked me to take a look at it and I could not see what the problem was. How is that top ring supposed to fit on the stock T-Maxx air cleaner? I looked at it and I did not see anything broken.