After cleaning out the exhaust port on my Echo 2601 trimmer I was putting the muffler back on with the same screws that were securing the muffler before. As with just about everything else I tightened them until they were snug and then giving them another big twist to secure them. OOOPPPSSS. I never thought about the head being an alloy and the threads just dissapeared. So now I have to secure the bolts into no threads. I tried using JB Weld but the heat was too high so it would not hold. I have considered using self tapping screws to see if that would work but I don't want to ruin my favorite trimmer. Any advice from anyone who is more mechanical than myself would be appreciated.