The Gen-16 Acoustic-Electric Cymbal System's Direct Source pickup is designed to mount to a bottom hi-hat cymbal and reside inside the hats. While this is very cool, it does require enlarging the standard 1/2" center hole in the bottom hat to 15/16" in order to accommodate the supplied mounting adapter. This mounting adapter allows the pickup to sit under the hi-hats so the bottom cymbal does not have to be modified. It's also useful for adding a second DS pickup for the bottom hat (as shown in the last photo), since the standard setup only uses one sensor, attached to the top hat. With two pickups you can separately mic the top and bottom hats and send the two signals to separate DCP channels for independent tone shaping.
It's a hollow-ish object, so if (like me) you're compulsive about getting all the support out it will take a bit of digging with a dental pick and tweezers. Only took a few minutes after printing on my Afinia, but really, you can just leave the support in there - it will do no harm.