I was riding the other day, and my Revival got much louder. I stopped to see what the problem was, and I thought I lost the hex bolt holding on the exhaust. I went home and looked at it closer, and I noticed that the bolt was broken in the cylinder. The bolt is broken in side, so there is nothing for me to grab onto. How can I get it out with out messing up the threads? I really don't want to go through the hassle of re-tapping the holes.