Hi Guys,
Well My fix for the two peice muffler is to install
a Nylock nut instead of the supplied one.
Go buy a 6-32 or 8-32 Nylock nut , after installing
on the muffler, run the engine thru one or two tanks
Than retighten the screw and nut.
No more lost back half of muffler.

By the way Charlie try to get Your hands on a new TH 75
Than You too will see how tight they are.
Just My .02!!!
Hoss Allen