Buy a Hurst! A little noisy but I love it! Anyway sorry for that..
When I bought a new shift **** it had 3 allen head screws that you screwed in and pressed againts the shifter arm. It was not threaded and worked out well.
Here are some pics... I wish I could find the **** now and show you how it worked ecactly...
See the lower section of the ****? Well when you unscrew that sections down it reveals where the allen head screws are. All you did was put the bottom section on first, then the top, screwed the allen head screws in, and then screw the bottom section back up over the allen head screws. Hopefully that is understandable.
I will try and update if I can find it, hope this helps a little man.