Hey everyone. Just one word of caution. I listened to some of the members who suggested that you screw the knob on as tight as you can, and then only one thread will show at the bottom. And most of the time I am sure you can.
When I did that, however, with my bare hands mind you, I heard a slight crack just when the knob was almost to the last thread. After that, I noticed that the knob would spin around a little bit, as if it were not tight. What I found out is that the plastic insert is glued into the wood knob. It is the glue, not the small screw inside the knob, which holds the wood knob to the insert. Evidently, the bond broke, leaving me with a somewhat wobbly shift knob.
Well, I could have left well (?) enough alone, but that's just not me. So I tried to remove the knob to see what had happened, but it would not come off. The knob would just spin around the insert. I had to take it off with vicegrips (around the bottom of the exposed insert, after removing the chrome retaining ring). Then I had to pry the insert out of the knob, find some epoxy, and then glue it back in.
Be forewarned, however, not to use to too much epoxy as mine slightly filled in the inside of the insert, where the shifter shaft screws into the shift knob. I then had to drill out the inside of the insert (slightly) so the shift knob would screw onto the shift shaft.
After all of that it went on good and tight, leaving only one thread showing at the bottom. That single thread is not really noticeable, at least to me.
So, be careful how hard you turn the knob, you could regret your effort.
Dean