I would like to make a mount for my LCD monitor, since there aren't any mounts here.

I want the mount to go up and down, left and right, far and close.

This one: http://www.amazon.com/gp/product/B000ID7QNI/ref=s9_simh_gw_p23_d0_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-6&pf_rd_r=07XVP2QMNH6W210T0P4N&pf_rd_t=101&pf_rd_p=470938731&pf_rd_i=507846 is easy to make, since gravity has nothing to do with it.

But if I want to make a similar one that also goes up and down, I won't be able to simply copy the way it moves left and right, because gravity will make the face of the monitor go all the way toward the ground. So, what can I do? How can I make it stop where I want it to stop?

You can see the monitor is easily moving up and down in this video: http://www.youtube.com/watch?v=KsJGOZT13LE (00:20 to 00:25)