I have owned this engine for a while and its been put through the ringer. i just recently mounted it on a skyraider low wing and during engine run up i noticed the exhaust (aft end) begin to rotate. So i removed that section and put some thread locker on and put it back togther. well it is still backing itself off. just wondering if anyone else has had this same problem and what can be done to correct it. the engine doesnt seem to be vibrating more than normal so im not sure what the problem is. thanks