Making a dual motor:
Check if antenne comes out back of pcb cover, if so reroute that to the front.
You rip off the heatsink (motor clippy thing), place second motor above first in the new empty spot you just made by ripping off heatsink.
Check clearance of gears and notch top section above idler gear (between pinion gear and axle gear) I like a round needlefile for doing this, but a knife or soldering iron work too. and after you're sure everything meshes nicely, has clearance, moves freely and it's all happy you can move on.
I said use aluminum strip (soda can) just because it's easy to bend, gives good electrical contact once you scrape the coating, and just about everyone has access to them. If you've got a nice hot soldering iron, solder the motor cans (shiney 'body' part) together so that they're paralell and the armatures are on the same plane. Roughen the surface, solder won't stick to chrome.
Making a custom shape steel contact thing for the endbell isn't the only way, if you've still got a soldering iron hot, make a thin wire jumper from one endbell contact to the other. BUT it has to be thin enough that your motor in the original place still fits.
Ok, now you can put the motors in and play with how the gears mesh. Ok, now stop it you're having too much fun with that. If your newly made 'motor assembly' doesn't sit level, grab some little screws and install in the holes under the stock motor well, this way you can adjust to put your gears on the same plain.
Now you'll want to do something to make sure your motors stay in place. Use your imagination. Tape, thread, plastic strip... Just remember it's probably got to fit a body.
Charge it up, and go challenge someone else to a "drag race", yours will take them off the line.
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Just make it up as you go, as long as they're mechanically and electrically connected, you can do your own thing. Maybe next time we'll go over making your dual motor chassis into a jacked up monster truck.
