I flatted a tubular this weekend, a Vittoria XG. It's a puncture at the stem, and I don't know if it's repairable. Any thoughts on the Vittoria Pit Stop inflator/sealant, or some other such inflator? Is there any other way to repair the tire at the valve stem? I'd rather repair it than have to remove it and re-glue another tire in the middle of the season. I'll replace it over the holidays, but 'til then, I just need a quick fix to get me through the next few races.