Pictures!

Once the leather boot is pulled up and the collar unscrewed then whole assembly comes out (this is the boot turned inside out, of course):






Remove the locking collar completely and you see another collar with two tabs through it and the leather, holding the boot to the shifter. Trying to just pull the boot off the **** at this point was stretching the leather around the holes and I didn't want to just keep pulling for fear of damaging the boot. Here is is pryed up on one side:




With the retaining collar pryed off you can clearly see the tabs protruding through the leather of the boot:





One of the pre-cut holes in the leather for the tabs to fit through: