An SRAM circuit operates at a reduced operation margin, especially at a low operating voltage by increasing or optimizing the operation margin of the SRAM circuit. An apparatus and method for spin-forming the end closure with the improved geometry is also provided herein. Thereafter, packet data is transmitted on the reverse link in accordance with the adjusting so that data throughput can be maximized. Also proposed is a method for manufacturing a separator plate assembly suitable for a PEM fuel cell. The method may be implemented in a printing device which is capable of programming an identifier and reading data from the identifier and comparing such information to evaluate the programming operation.