A system for inductively cross coupling resonators. The rubbing device and the pounding device are provided with a shaft driven by a motor. This cap is particularly intended for use as a spray head for a spray device. The captured data is applied to another algorithm to find the FM modulation profile. A second configuration provides that the air in the cavity be evacuated, thus pulling the movable lip away from the window. Several embodiments of mounting rings and assemblies are disclosed which improve methods for assembly of the powertrain.