I have not re-machined any wheel centers, but I have thought about it, and done some measuring and figuring. I even had some wheels made with the 10 bolt pattern like on our AD trucks.
I can say that I did not find a 20" or 22.5" wheel that was suitable for re-machining to the 10 on 7.25 bolt pattern. And that there are problems with making adapters from the 10 on 7.5" bolt pattern to another, the two patterns interfere, it won't be easy if you can get it to work.
I had some wheels made by Stockton wheel, and I would not deal with them unless I lived down the block from them. They did decent work, but it was very slow, and about impossible to get a straight answer. I did visit them in person, and they are nice people, but I would not deal with them over the phone.
You may try
http://www.ricksontruck.com/ I bought some tires from them, they seem to be nice people too. When I was there they were in the process of setting up a machine shop to make wheels. They may be able to help.
Grigg
