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First,stuck the rods on the 2 ends on the piece of wood thats 8cm,then,put the wheels on the rod after,put the nail in the middle.
Next,stuck the shorter piece of wood on the nail,use dubble Side tape to stick the magnet on the shorter piece of wood.
Finally,use dubble side tape to stick the second piece of magnet on the stick .
Use the stick to move it.