That sounds like GB, or as I call it "Gear Worst", 3mg. My first, last and only experience with them was a disaster, too.
Well, I did give them a full description of what failed so that may have helped. I do suspect it's a common problem because the muffler is completely supported by the exhaust pipe and, in turn, supports most of the weight of the heat shield. Kind of a questionable design in my opinion, but then again I don't design and market small engines. I get the feeling I'll need to did-assemble most of the shrouds and other trim items on the engine to get the new parts on. I'll have a look later today and get that done ahead as well.
Well, I did give them a full description of what failed so that may have helped. I do suspect it's a common problem because the muffler is completely supported by the exhaust pipe and, in turn, supports most of the weight of the heat shield. Kind of a questionable design in my opinion, but then again I don't design and market small engines. I get the feeling I'll need to did-assemble most of the shrouds and other trim items on the engine to get the new parts on. I'll have a look later today and get that done ahead as well.