Anyone experience this on an Alpha or other plane? Once the engine gets hot, the muffler spins (muffler, screw & nut become one). When its cold, it's tight as can be. It's making quite the mess. I believe the aluminum is actually breaking down (Gray/black matter) and spraying along with the exhaust. Also, when i took it apart, the disk inside (bear with me, my terminology is not so good) is broken. Does that make any difference as far as how the muffler works?