Correction, I rest one hand on the Oreck Orbiter handle to turn the switch off/on if needed, the other hand and knee on the shaft connecting to the machine. I hope this makes sence...It just works.
Despite my reservations, the Oreck Orbiter can be purchased at my new "all orbital, all the time" website
http://www.planet-orbital.com. It is shown in the "floor machines" area, not as a stair tool.