Is the case cast aluminum? If so, there is a repair rod that does a
wonderful job of joining aluminum (cast, rolled, extruded, romanced ...)
at low temperatures. Can be done with a propane torch and is very easy.
I got it at the annual fly-in at Oshkosh. You can find it other places
but popular there because of repair of certain aircraft parts.
If you feel wild, or know someone that is, I could send you a couple of
rods of this stuff and some instructions and you could try to reattach