An apparatus for controlling a variator having at least one roller between two toroidal disks may include at least one actuator responsive to fluid pressure at separate high side and low side fluid inlets thereof to control torque applied by the at least one roller to the disks. The method comprises up-shifting the transmission based on whether engine knock limits spark advance at engine conditions after the up-shift. A first insulating layer which is composed of an electrically insulating flexible material conforms to at least part of the perimeter of the PTC element. After receiving the NCF, the receiver waits for a timeout period and resends the NAK if no repair data is received. Stirring is continued under inert atmosphere at room temperature for another 4 h. The wafers are physically bonded to each other through a relatively simple method, and then electrically connected to through TSVs or butting contact holes.