Fangjia can be guided by a magnet grinding needle, but it is often slightly to the east and not completely to the south. The water floats more and more. Finger claws and bowl lips can be used for it. It runs very fast, but it is strong, slippery and easy to drop. It is best not to hang up. The method is to take a single cocoon from a new cocoon, use mustard seed as wax and put it on the waist of the needle. If you hang it in a windless place, the needle will always be a guide. Among them are the northbound guide and the northbound guide. The guidance of a magnet, especially the west, is unreasonable.

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Fang's household magnet is ground into a needle (the shape of the needle is pointed), so it can point to the south, but it is often slightly to the east, not all in the south, and often vibrates and swings on the water. You can do it in your hand or on the edge of a bowl. It runs very fast, but it is easy to fall off on a hard and smooth surface, but it is best to hang it. This method takes newly produced silk. Tied in the middle of the needle and hung in a windless place, the needle often points to the south. Some of them point north.