[Zeke]

It's not too tough, but damn heavy. There will be a stop to remove, then just wind it all the way out until the threads disengage. Then, with a lot of help, you can pull it off the saddle. Be careful not to nick the edges of the sufaces that ride against each other or bind the work table when removing.

I'll bet you can download a manual that shows how to adjust and maintain your mill. I know I was able to do so for my old Altas lathe.