Okay so completed a similar project the other day,but I am addicted now. I built a parallelogram binocular mount similar to this. Now I am trying to come up with ideas for a binocular chair....like this I would like to make the chair recline though. This is where I need help. I need to make it so goes up and down slowly (since in my design, the binos will be attached directly to the chair) , perhaps by use of a hand crank. I was thinking of using some kind of spiral jack or something... It needs to be cheap and the premise should be something along the lines of, I turn a crank and it raises or lowers a cylinder or something to that effect. Any ideas are appreciated and images of those ideas too if possible. I am also going to use a similar method to make the chair rotate about the vertical axis too.