how do i get this off?
I would use a vice grip and turn. With out the locking nut, it must just be set all the way down. Check the threads after you take it off. Perhaps he put on a knob with the wrong size threads. If so, I think a tap and die tool might fix it.
From this DYI the pic looks like the shifter is on plastic on the bottom:
https://www.s2ki.com/s2000/topic/772...e-shifter-diy/
Look at the 8th picture, I could be wrong but better to be safe than sorry. Good luck with the knob. It took me almost 5 hours to get my wheel bearing bolt off to grease and restrike it. But that was rusted on.
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I wouldn't stick it in gear to stabilize this type of removal. Could end up needing a ton of force to get off.





