OK, I'll try to explain what I mean. The screw would be mounted so that it would be parallel to and about a quarter inch from the ceiling. at one end would be a motor that turned the screw and at the other end it would be suspended on a bearing so it could turn. The nut would have a small axel with a wheel on either side, just before the wheel on either side of the nut would be a hook to chain a lamp. The direction the motor turned would dictate which direction the lamp would travel and which wheel would press against the ceiling,
Any one KNow what motor would work?
oh yeah, thanks for the input