How can i remove the chuck on my Bosch 12v Drill/Driver?

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How can i remove the chuck on my Bosch 12v Drill/Driver?

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I need to replace the keyless chuck on my bosch drill/driver, i have removed the screw from inside the centre of the chuck. There is a spline inside i assume this secures the chuck, but how do i remove it, i have tried to turn it with a spline key but it won’t turn and i cannot get it off.