Done wrong, but done on traditional Chinese standards. With her own guide (North) must remember the Red needle is a needle guide refers to the North, save time is enormous.   2 . User's Guide (North) needle, there must be no next iron, magnet, such as Guide (North) needle use items; guides (North) needles must be flat (more importantly inside the needle or dial to flat) 3. part-car Guide (North) ball drivers save time, guides (North) balls made in opposite directions. Driver sits in the cab saw Guide (North) ball of the words above: East, cars going East, use Guide (North) ball to make sure there are no using reverse manufacturing. 4. Guides (North) PIN when not in use, away from the magnet, magnetic materials, such as iron thermostat light storage.