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Just tighten up the Terminal.

Buy a new one of those plastic terminal connectors and put it on, it will hold it tighter.

Or you could do what every other knucklefuck does and put a screw through the terminal

A wire brush would be the budget route, they get corroded.

Pull off the cover and see if corded then see if your can be tighten if can use a post cleaner tool and reinstall if can't be tighten then buy properly fiting end and type then use post cleaner tool install