Have a look at this thread, it may give you some ideas.I made mine 3/8” for the bolt hole and 1.000” for the big hole.
Thanks, I had seen the thread just didn't see the final #s on the holes.Have a look at this thread, it may give you some ideas.
http://www.skidsteerforum.com/DesktopDefault.aspx?tabid=54&frmView=ShowPost&PostID=29853