I had the shop guys at work machine a socket for me to allow it to fit into the pedal bore, engage the hex on the cone, and allow an 8mm socket to fit inside of it. Because the square drive had to be cut away, I use vice grips to hold the outside of the socket. It's not pretty, but it works. With some patience, I'm sure you could make the same thing by hand with a Dremel or similar rotary tool, though a lathe made quick work of it.