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The spinning structure depends on its axle. The outer ring of bagua is fixed, the inner ring carrying the talisman turns, and a copper foil washer between them reduces friction. Too much play and it rattles, too little and it grinds, so assembly is a matter of testing until a flick of the finger gives three or four turns. The axle is riveted and cannot be taken apart; force it and it will not go back. Long use loosens it, and past a point it starts to wobble, at which stage it has to go back to the workshop. A worn-through washer announces itself with a rasp, and that is when it wants oil: one drop of watch oil is plenty.
The sign spells the name with a common variant of the second character; Daoist texts normally use another, meaning the region of sky around the pole star, called the emperor star. Daoism lists it among the Four Sovereigns, in charge of the stars, a very high position. The two spellings have been mixed for a long time, and most buyers don’t distinguish them. Ziwei doushu takes it as the chief star, a separate system of fortune-telling with nothing to do with the pendant. In the sky the pole star does not move and the rest turn around it, and that is where the name comes from.
The talisman is cut on the inner ring, with deep lettering so that it stays visible as the ring turns. Thin cupronickel sheet warps easily and has to be flattened before assembly. The trigram lines on the outer ring must align with the inner ring; half a grid out and the mismatch shows with every turn. A broken or unbroken line is yin or yang, and a mistake in cutting is obvious to anyone who knows the form. The face is polished bright so that light travels around it as it spins, which is the selling point. Satin versions exist too, where the light moves more slowly, and opinions differ.
This is a necklace, chain included. The moving part dislikes pressure, so take it off to sleep or to move furniture. Some people turn it while thinking; turn it enough and the axle loosens, and a loose axle means a return to the workshop. Choose a finer chain, since the pendant has its own weight. In summer the metal leaves a mark on sweaty skin, so wipe it when you get home. Don’t pick at the outer ring with a fingernail when turning it, because the bagua edges chip most easily. Check the small loop at the top regularly and replace it when it thins, rather than waiting for it to fail.
What the name points to here is the stars, not fate. Asked whether it can change your luck, the answer is no: it is a copper piece that turns. Don’t hang the prayer-wheel idea on it either, since that is something else. If you want to explain it, explain how the seven stars of the Dipper circle the pole, which is better than something mystical. A customer who understands buys with confidence. The grass radical in the second character is a later vulgarisation, and saying so costs nothing. The price reflects the turning structure and the engraving, not the name.