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Use a M3*5 screw to secure the M3*8 two-way hexagonal copper post on No. 1 board.
ii. Electrical Module Assembly
Use a M3*5mm screw to mount the previously installed circuit board on No. 1 board.
Use M3*5 screws to fix M3*25 Bi-pass Copper Standoff under the No. 1 board.