Originally Posted by mach4

There are two types of lock nuts. The older style takes a custom socket like this...



I've heard of people using a piece of tubing and grinding away areas to get to the pins as shown.

And the newer style nut looks like this and takes a deep socket 30mm 12point



If you have problems finding one, a 1-3/16" deep socket works just fine too. And if you can't find one of those (I couldn't), you can make one out of a standard 1-3/16" socket and just cut the back off and weld on a 15/16" socket, and you're good to go.