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Okay, here's what I did, and I believe it's the easiest way.
I sanded down the chassis toward the back of the heat sink and then I slotted out the back of the heat sink between the hooks and set the new motor in the slot. I soldered the new motor to the heat sink. (now you have your positive juice) Make sure you line up the pinion with the transfer gear properly before you solder.
Next, I just soldered a tiny wire from the end ball on the new motor to the negative wire of the orig. motor. The negative wire is the one that attaches to the piece of metal that contacts the end of the motor.
Now you have a VERY clean added motor and no goofie piece of metal to deal with.
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