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The picture is just a rough draft of how I do my dual cells. "A" is where I take out a rectangle piece of plastic, so there is a hole in the bottom of the bit. You'll have to make the hole just big enough to set the battery in it without the battery falling through or touching the ground. "B" is where I cut a chunk out of the wall that seperates the motor compartment from the battery compartment. That's not an exact science, just cut so it will sit back farther. I usually have to cut part of the cars right motor compartment out some. Don't cut both sides cause it might make it weak. I'll put another pic here about that. "C" is The wall part that I cut. Note that you an't cut too far down because you'll cut into where that back axle sits. And, you can't cut too far back, because you'll cut into where the middle geer's bar sits. Just go slow and be patient the first time. If you get it right, then you'll have a car with good balance, speed, and control.
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