It basically replaces all the inner spider gears. The outdrive pins are sit in the groove and the locking "case" engages where the cross pins would normally go.
that's what maximizer r/c made. you glossed over my first answer and focused on the second!
Hmm, very intersting. I like the cen piece as it is 6 bucks vs maxmizer's highway robbery... But it is ano-d red and that must add at least 5000000psi to the tensile strength....