You seperate it where the black plastic connects to the metal shaft in the previous pic. Heat the shaft with the torch some and grab the upper part with vice grips and pull.
-- The B&M shift knob I put on uses a plasitc sleeve that I pounded onto the bare rod and then screwed the new shifter onto it. I recomend getting a new little plastic piece at the bottom of the pivot on the previous pic and also the green "truck" gasket that the larger half circle (with the spring above it) glides on. -- Hope that makes sense--
Also for the 2 rubber boots, use a hose clamp to tighten them onto the now smaller bare metal shaft.
My Shortened one:
It's a pretty good mod. I did mine and it feels way better. A little more effort is required to shift but it looks much better and doesn't require a whole body movement to get from 1st to 2nd. Only downside is that it is kinda hard to get into reverse if your transmission is in less than perfect shape like mine.
this is my modified sogi short shifter. i did the normal mod but then cut off an additional 1.5". but then i notcied how hard it was to get it into 2nd gear. you have to practically push back and down. so i heated it up and bent it so that when 2nd gear is fully engaged the shifter is straight up and down. its a bit of a reach over stock, but im 6'3" so its all good.