There is a 7-tooth pinion gear for bits. I was looking in my box of spare parts after I read this post and I've found it. I believe this pinion gear came from the MicroBlast mini r/c's that they sell at Target (or Walmart?). I'm pretty sure it came from that car, but the Motorworks 1/64th Nascar could also be the one.
I wish I could be more specific, but I'm positive it's from one of the two.
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