Can't take off the shift knob (Manual) LR Disco 1
 

I'm hoping this is the right place to post. I'm trying to remove the shift knob on my 94 Disco (5 speed manual) for various reasons, and I can't seem to get it off. I've seen videos where it just seems to thread on and off, but I can't get it. Are there any special tricks I need to know?

Thanks all.