An actuator is provided to generate an ultrafine stroke according to a fluid input pressure such as air pressure or the like. The exhaust valve is alternatively opened by an exhaust valve actuator installed separately from the shift actuator. In the exemplary embodiment, the two-way communications device integrated in the PFD would provide an antenna integrated into a shoulder of the PFD. The differential phase between these simultaneously taken known and unknown instantaneous phases will be close to either 0, +120, or \u2212120 degrees, thus identifying the line phase at the line under test. A seed layer of non-magnetic material is electrolessly laid down, following which a second layer of photoresist is deposited and patterned to form a second cavity that symmetrically surrounds the first one, thereby forming a mold around it. The second door rollers are installed between the first door rollers on the door leading end side and the door trailing end side.