pull the UR crank pulley. I'm sure there's a better tool, but with what I call a "regular" puller (3-arm generic type), I had to get creative in preventing the claws from slipping out of the holes. I couldn't get it to grab the outer diamater edge without damaging it. Aluminum = less forgiveness when applying leverage.
I suspect the next time I have to pull it, I'll put the OEM piece back on.