you use a normal motor but rig it up with a worm gear, the worm gear directly to a gear on the drive shaft, this way you tonnes more torque then before, and you're speed will only suffer a little bit, depending on the amount of "threads" around the worm gear, for a little more tourque put a resistor in series with your motor, experiment with some to see which willl give you enough tourque and good speed.
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