A throttled data pipeline having a limited data-transfer rate for conserving system resources is disclosed. A concave arcuate surface of revolution about the egress orifice is provided and depending therefrom for enhancing droplet separation from the egress orifice which in turn insures uniform droplet formation and dispensement. The sleeve extends along the linear conductive element to a location between the connection of the source of RF energy to the linear conductive element and an end of the linear conductive element where the sleeve is conductively joined near to the linear conductive element. The refractive index of the waveguide walls is less than the refractive index of the color filter. Additionally, deformation or dimpling is avoided because the small-diameter portion of the fastener does not produce axial frictional forces on the sheet material as it passes through the sheet material.