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1786/1787 particularly emphasizes that the hardware of the golden ball is made of white steel, and the effect is achieved by mechanical and manual polishing and carving. It is not ordinary die-casting, and the gaps between the textures are bright, and the large surfaces are matte. This is also processed separately in the later stage, which is very complicated. The most important point is the polishing of the inside of the sphere to ensure the smoothness of the chain shuttle adjustment process. This also requires the chain to be polished very cleanly to achieve the overall effect.