That metal tab sticking out forwards at the bottom is part of the casing and so should be connected to all the other external metalwork.
So you'll find it much easier connecting a ground wire to that than to the side of the pot. I'd double check that's so with a multimeter, but I'm sure it will be as all the bare metal surfaces seem to touch.
Don't forget to scrub the surface of the tab with some fine sandpaper so the solder takes more easily.
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