A robotic arm that can be fully manually controlled by the keyboard keypad.

(the download seems broken so here are the links)
If you want to download it just go here:
http://www.snarkpit.net/files/HL2/prefabs/274-robotic_arm.zip

A Image of it in action is available here: http://www.snarkpit.net/files/HL2/images/prefabs276.jpg