Hi, I am trying to make a conveyor that has a roller expension mechanism. Please take a look at this drawing. http://www.flickr.com/photos/46279408@N06/4251882419/sizes/o/ [Broken] As the drawing shows, you can imagin two supporting beam on each side of rollers as rollers will need to be fixed or assembled to something. I don't know where do they need to be attached for the expension mechanism. But anyway, I need those rollers to be gradually expended as they rotate just like a conveyor and I also need each individual roller to be spined as it moves. How can I possibly do this?