IIRC I've had luck with Superglue, Solder, and epoxy in different cases.
Pot metal is a random mix alloy. Some pot metal is easy to solder, some isn't (also thermal shifts sometimes cause it to crack or even explode depending on the alloy). I'd probably try a test solder in a discrete area away from the damage and goto super glue and or epoxy if it won't solder.
If I had to glue it I'd superglue the cracks back together then on the inside where it can't be seen epoxy a metal reinforcing bar across the crack.
Make sure your glue can take the temperature that part gets in operation...Super glue melts near soldering temperature.
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