A foot scooter adapted with a stabilizing mechanism secured to hardware associated with the upper assembly of the scooter in front of a use’s knee high location. The first and second photo-detectors may have different depths and respond differently to light having a specific wavelength. The logic circuitry generates signals usable to control a transmitter. In addition, co-firing allows multi-layer capacitor structures to be constructed, and allows the capacitor electrodes to be formed from copper. An elastically deformable ring fastener, preferably as a layer on the outside of the delivery device, is provided and its wall thickness, prior to installation, is larger than the gap dimension. The safety arrangement can be combined with a utility tool, e.