Hi Jason,
Yes, it just replaces the flat upper clutch retainer ring. I wanted it to still use the 6-32 - 1/2" screws & nuts, but it also works with an M4x12mm screw and nut. The "button" is just a separate flat piece that fills the center space. Totally unnecessary, but adds a nice touch. I can add them to the contributor's files. The center clutch hub remains the same, it's just the height of the top ring that changes. I can post a few different heights that should fit most of the stock plates. The button is just friction fit, and is easily popped out from the bottom.
Ed