My 2188 has a leaking tire on the right side. The tire is "rigged" tubeless, by my tire guy. He said the tire has side wall cracking on the inside and it was pinching the tube and caused it to go flat. He removed the tube and put a hex nut with a threaded hole in the center to accommodate the valve stem. This worked great for about 2 months and now it leaking between the valve stem threads and the nut. The style of nut looks to be specifically for this type of fix so I don't think it just some kind of bull ship rigging. I know and plan on putting new rubber on it for next year but would like to get through this season with the old ones. How can I fix this leak without breaking the tire down?