There are no screws on the stock one. Just unscrew the knob. The stick is threaded on the end.
As far as the MOMO it doesn't have threads. It's a bored hole that will have a rubber insert to make the threads fit snug in there. Then it has 3 set screws that you screw in to hold onto the shifter. You can't see the screws in the pic because of the sleeve that screws onto the bottom of the knob to hide the screws.
The combat is great btw! Had a silver one on my last car and loved the feel of it in my hand muhaha
EDIT: Just noticed it's the 'evo' which I hadn't seen. Mine didn't have the butt crack on the top so I can't speak for that one...I had the older one, smooth with little finger grips on the front. I would imagine it feels about the same though, same general shape.