Method and apparatuses for clamping a disc cell assembly. An apparatus includes a first plate coupled to the disc cell assembly, a second plate, and one or more disc springs between the plates configured to apply a clamping force to the disc cell assembly when compressed. A method includes adjusting the clamping force via a central fastener coupled to the first and second plates until a desired force has been achieved. Perimeter fasteners coupled to the first plate, second plate, and the disc cell assembly maintain the clamping force after adjustment.