A scooter steering control on small-wheeled scooter having a steerable front wheel on a handlebar, the control comprising two split sleeves fitted around the handlebar and the mounting tube on the scooter body, and a control pin slidable on the upper sleeve into and out of a recess on the lower sleeve. The pass-through device includes a communicative passageway for a fuel supply line and a through opening for electrical connections, and may include additional communicative passageways for fuel return lines, and purge and fresh air inlets. The device can be placed in a room of a structure, the room then filled with artificial smoke, and a fire fighter trainee can then search for the device in the structure. The restraining apparatus engages the track to prevent the food and beverage cart from lifting when the aircraft encounters sudden drops andor unexpected turbulence.