I had to make a puller

They were actually on there pretty tight! You bet. I plan on removing to get at the inner seal as well. I think you are right with the 3/8, but they are 12 point according to what I have now read. I believe you can grease the wheel bearings and or remove the entire assembly by working through that hole. The grease zerk is at the upper left in my pic. Tomorrow's tasks!