Depends which rim you do it on. I believe the rear has a retaining ring where the front doesn't.
I did get the retaining ring off the rear. I tried putting a drift through the hole in one and tried to pop the opposing one off buy hitting the rear of it with the drift. It seemed like there was no way to get it to hit the back, it simply kept going out the center hole on the opposing bearing. It felt like the channel was barely as large as the center holes in the bearings, so there was no way to get behind it.