First check if the batteries are all good. If all batteries are good, check the carbon brushes if they still able to make contact to the armature of the motor. If the carbon brushes cannot make contact or all worn-out, replace the carbon brushes. If if it still does not work clean the armature of the motor by using emery paper. If still it doesn't work check your armature bearings and armature. Replace the defective parts.
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