Hello.. I'm Mr. dead... Please look at the attached file and feel free to elaborate or redesign or post links pictures of something already like it. I forgot to put that a chain could replace the downward shaft with a tensioner. Anybody could build the box with a welder it is the gears we all would need. I am attaching a rough idea and allow anyone to use this idea freely from now on.. That it matters.. Not for one person but for all to use and produce..