After I posted this I read that Scott is sick, I wish him well. I have sent him another e-mail and I am sure he will respond when he gets caught up.
The muffler fell off because I didn’t check it and safety wire it. I bought the plane assembled and should of checked the muffler bolts. I will safety wire the muffler bolts on the new muffler.
High Temp Red Lock tight will work, but if a bolt breaks off then they are real hard to get out. Thanks George