Methods, apparatus, and systems for improving andor simplifying one or more seals in a fuel cell stack, such as a vehicle fuel cell stack. The master cylinder also includes a cylinder wall associated with the master cylinder housing extending axially along the cylinder axis. A planar SOI MOSFET including a strained channel region formed on another portion of the silicon layer. The control signal controls a variable current source to regulate the charging current provided to a charge storage component. A conical intermediate surface forms, in cross-section, an acute angle of about 13\u201319\xb0 with an envelope surface of the rear mounting portion. The first orientation and the second orientation may be orthogonal.