| 摘要 |
A control unit for use in a window blind head rail assembly comprising; a sprocket wheel, a chain guard housing, a sprocket support and wrap spring, a splined bush for engagement with a roller blind. tube and a centre pin, wherein the centre pin comprises a centre-pin head and a body, the centre- pin head including one or more fins adapted to co-operatively engage with one or more recesses in the sprocket support.
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