As the title suggests, I modified the MPA handle for the Cadex by sanding the JUNK out of it. Only, I went too far. So, there is a collar at the top of the grip (referring to the hand part, not the finger part), that pertrudes and keeps it from fitting, so you have to remove it. And, if you look down from the top, you’ll see a little flat shelf that may look like it’s the height that would be required for chassis other than the MPA. It’s not. Please note that you’ll need to leave a little lip there still, and you can see about how much judging by the gap in my handiwork. For my next trick, I’ll be building it back up with some epoxy.