Light Rail Add-A-Lamp.
Light Rail Add-A-Lamp. at HorticultureSource.com -
Light Rail light mover 3.5 Add-A-Lamp allows you to run two reflectors back and forth with only one motor instead of just one.Comes complete with a threaded pole that attatches the main robot motor with the trolley, a section of track ( both approximately 6 feet in length )and a trolley with screw pack.