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As for sun-by-bolt bolt and inner, the shape has changed from the end of April to improve strength. The previous ones are (1) a round type with no flat part on the bolt, (2) a square type in which two parts of the bolt are flattened, (3) a D-shaped part of the bolt flattened It became a type type. There are two grooves in the inner inner part where you pass the bolt, and the bolt has a protrusion that is hooked on the groove.