At the motor end of the cable, it screws in SO First unscrew the small grub screws and remove the flexible connector, Next unscrew the four screws on the casing. As seen in the attached photo, this reveals the connection. There is a hole in the shaft to insert a thin rod so you can unscrew the cable. Unscrew the cable and replace it. do not over-tighten the casing as it can crack. Click image for larger version. 

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