Originally Posted by Tony 76
I think it sounds like the fixed threads inside the shifter knob separated from the actual knob I would try pulling on the knob see if it comes off then put a vise grip or what ever to take the nut or what ever piece it has off.
But then how'd he loosen the bottom nut? The threads would be all over the place.
If that is the case and it's not stripped or something, you can just reapply the tube with the threads. Hopefully. Pray you don't have to get the threads pulled and get everything rethreaded.