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Drive M4*10 screw (C) x4 into wall/ceiling main bracket (A).
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Drive M3_L25 screw x2 (D) into electrical box (B) through bracket hole.
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Attach CBA850 (E) onto 4 M4*10 screws (C).
Drive M4*10 screw (C) x4 into wall/ceiling main bracket (A).
Drive M3_L25 screw x2 (D) into electrical box (B) through bracket hole.
Attach CBA850 (E) onto 4 M4*10 screws (C).