Almost over the horn, here is the first MOC of this 2014.
This a little and simple MOC designed in about 5 hours for the Hispalug Expo Event.
For the alternative movement it uses a freewheel mechanism with a reverser(for up and down)
It can lift more than 1kg. Enough to lift my Mini.
A little video.
Finally you can download complete building instructions in the INSTRUCTIONS page, enter and access to the Download folder.