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BackMount, https://www.neutrik.com/en/product/nc3mahl A Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel: mini toggle: 4mm above panel, tight but possible mini toggle: ample space above pcb micro toggle: probably too short without extra spacers, use mini toggle switch ON-ON Push button switch, generic, two pins