What gives? Got the saw about 3 years ago and had no problems. Lost a muffler bolt (it happens). Bought a new muffler and tightened down on the bolts like a SOB. I still cant keep a bolt in there. It tightens up just fine - nice and snug. But after a few minutes , I'll check it, and sure enough, its about to drop out! Have you guys had this problem? I dont want to 2 part-epoxy it in there, but I dont know what else to do. Any suggestions?