KW300 - Dough Hook Spindle Snapped Off Inside Planet Hub

Hi,

We have a Kenwood Chef KW300. Unfortunately the spindle for the dough hook has snapped and part of it is stuck inside the planet hub of the machine. I have stripped down as far as I can but cannot remove the 'Sun Gear'. Does anyone have any advice as to how I remove this component? I have attached a photo of the Sun Gear, there appears to be some sort of nut fixing what looks like a fly wheel in place. The nut is round with a flat on one side. I have tried pliers and pipe wrenches, but all that does is rotate the entire sun gear/flywheel mechanism.

Any advice would be much appreciated,

Many Thanks,

Nick.