Computerized Etch a Sketch

Step 2 First bit--figure out how to add the motors

OK, the first thing you need to do is pop off the two knobs on the etch-a-sketch. They're just pressed on, so jam a flathead screwdriver under them and pry them off. This entire setup is reversible, so hang on to the knobs in case you ever want a normal etch a sketch again.

You should be left with an etch-a-sketch with two metal nubs sticking up, each with a flat cut into it that used to mate with the hole in the knob.
Grab a calipers and measure the diameter of the metal nubs. Write it down somewhere.

Before you go on to the next step, play the song 'Neigborhood 1(tunnels)' by the Arcade Fire on your home entertainment and theater surround sound audio system and let its genius blow you away.