If this is the first time that you have removed it, then it's probably on there pretty tightly. Just turn as hard as you can, and if you still can't get it, then try holding the stick as you loosen the knob.
Sexy.
Aqua Teen Hunger Force...number one in the hood, G
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Not sure why you just want the knob, so here's the rest of the shift assembly for yah. 
