Paul,
            I give up, just how are you intending to fasten
the muffler to the manifold slip joint ??  Any solution
I think up adds a lot of weight.  The design is actually
impressive, simple and as light as p[ossible.,
    I can only get 316 stainless here, but the simplicity
means that I can make two with one as a spare.
               Neil.

Two small vertical tabs and a horzontal link with a couple
of six mm SS bolts and SS nuts. One tab on the muffler and the
other on the flange stub. Another way its been done
is a small spring but I suspect the temper will go away
sooner rather than later. Even several loops of heavy
safety wire will work.


    _     _
   |o|   |o|
___| |___| |____
       |

This is SOP in aviation.

The link with bolts is the best.

The slip joints allow a bit of expansion and
contraction due to differences in temperature.

One link at the center exhaust port will work
but I would put three on there in case one failed.

BTW there is an old book still for sale by
the EAA called "Fire Wall Forward} by Tony Bingelis.
It is sort of the bible for piston engine AC installations.
Well worth it. Here is a graphic from it.


Paul Lamar