The wire insulation had to be removed to connect the bare wire to the motor. The wire comes with only 1/8 inch of bare wire and that is enough only to solder the wire to the motor loop. But, 5th grade students did not know how to solder or did not have the equipment needed. So, 1 inch of insulation had to be removed. The wire was cheap and fragile, and wire strands got removed with the insulation using a wire stripper. Finally, burning off the insulation solved the problem and prepared the wires for further use. None of this was in the instructions.