A fastening system for a vehicle body passenger compartment includes at least one fastening element mounted with respect to the vehicle body to be exposed within the passenger compartment, and at least one connector configured to support a convenience device, such as a cup holder, reading light, power source, cellular telephone charger, etc. The screwdriver has a driveshaft having two ends each adapted for receiving the shank of a screwdriver bit. A cap cover is slidingly received upon the rod and is adapted to be selectively engaged with the collar. A relative time-delay bias from a delay estimation algorithm within the receiver. The dielectric region has a thickness ultimately desired to removed by polishing prior to moving the workpiece on to a subsequent nonpolishing processing step.