I got the Ikea SKARSTA desk http://www.ikea.com/us/en/catalog/products/S49084965/, it's a sit stand desk that uses a manual shaft to rise and lower the desk.
So I plan to make the desk motorized using a satellite dish motor and a satellite positionner to control the motor (I removed the linear actuator part and kept only the motor).
The problem I'm facing is that the space between shaft and tabletop is about 1cm, so I'm not sure how can I transmit the rotation from the motor to the shaft (which is simply a long Allen key).
I looked into pulley systems and cogs but couldn't find suitable pieces, please advise.
Many thanks.
Update Jul 9:
The problem is how to transmit the rotation from the motor (green) to shaft (orange), motor can be placed at any position relative to table top but shaft isn't.