For this instructable you will need (ideally):
Apple Pro Speakers
a 12v motor with a shaft diameter not bigger than 1/8" and a housing no deeper than 2" (The ideal motor should have 3 or 6 threaded holes on the output side. The one I used was a samsung capstan motor from a trashed video deck. The most important things are the threaded holes)
a rubber band
a big nail
super glue, or really, really good glue, let's not get too high on ourselves now
a reamer-like file (I used an old phillips screwdriver, I had time to kill)
bolts that fit the threaded holes on your motor
a 9-volt battery
a 9-volt battery connector with useable leads (see parts source in the next item)
on-off switch (destroy one of your, or your friends' children's battery-powered toys - they need to use their imagination more anyway!)
soldering iron (or you could forgo the switch and soldering iron and just twist everything together)
a wheel from the toy you busted up - minimum diameter 1 3/4"
1 bottlecap leftover from your Laptop stand from 4 bottlecaps
3 nails or other hard, metal, pointy things
Step 1: Disassemble the Apple Pro Speakers
Step 2: ...but Can It Core a Apple Pro Speaker, Oh Chef O' the Future?
Step 3: Admire the Hunk.
Have a beer.
Step 4: No Guts, No Glory
Step 5: How to Eyeball Like a Pro
See how gravity kind of "wants" to center it? If your motor has 6 holes, line up your target holes along the plastic "beams" and the other 3 hole along the curves of the outsides of the "beams". Now, using flame and a big nail, burn holes through the plastic directly above the threaded holes in the motor. Try not to go all the way through. The last thing you want is molten plastic dribbling into the motor. Use your reamer-like thingy to file out the holes.
A lot of this project is subjective. I just happen to be a packrat when it comes to tools, fasteners, and gadgets. I just happened to have the perfect size bolts for the right size motor for the speakers. It was a personal trifecta in my case. Try to do your best with what you have.
Step 6: Screw It
Note: you don't want bolts that are too long. Make sure they JUST go into the motor housing. Too deep and you'll damage the motor.
Step 7: Ooh, Can It Core a Apple...
Note in my pic: I used a rubber band to hold the wires in tighter in case the whole thing flew apart.
Step 8: External Input Device
Wire the battery to the motor as needed, but you have to stick the grill back on or the speaker will get hung up on the opening.
Forgive the blur.
Step 9: Self-centering
Here's, I think, my favorite part: when you screw the metal collar back on (remember to use all 3 arms), the motor self-centers
Step 10: Get Your Motor Runnin'
Full-disclosure statement: The bolts I used to attach the motor to the core had round heads and they're preventing me from pushing the grill all the way on. Yes, ghetto though it may seem, that is tape on the grill, but it's "invisible" tape so you can't see it, right?
Step 11: Creating a Black Hole in My Office
Have a beer.
If you stand it on the flat part of the housing and you have exactly the same size wheel that I'm using, the speaker WILL just sit there. note in the video if you start it "upside-down" the weight of the motor will cause it to touch the wheel to the floor when it starts to slow down. Then the wheel gets it going again.
Now do the right thing and give this to the kid whose toy you broke. Nah, screw him. He can build his own. Finish the beer and play!